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C Programming Tutorial

i

C PROGRAMMING TUTORIAL

Simply Easy Learning by tutorialspoint.com

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Table of Contents

C Language Overview .............................................................. 1

Facts about C ............................................................................................... 1

Why to use C ? ............................................................................................. 2

C Programs .................................................................................................. 2

C Environment Setup ............................................................... 3

Text Editor ................................................................................................... 3

The C Compiler ............................................................................................ 3

Installation on Unix/Linux ............................................................................. 4

Installation on Mac OS .................................................................................. 4

Installation on Windows ............................................................................... 4

C Program Structure ................................................................ 5

C Hello World Example ................................................................................. 5

Compile & Execute C Program ....................................................................... 6

C Basic Syntax ......................................................................... 7

Tokens in C .................................................................................................. 7

Semicolons ; ................................................................................................ 7

Comments ................................................................................................... 8

Identifiers .................................................................................................... 8

Keywords .................................................................................................... 8

Whitespace in C ........................................................................................... 9

C Data Types ......................................................................... 10

Integer Types ............................................................................................. 10

Floating-Point Types ................................................................................... 11

The void Type ............................................................................................ 12

C Variables ............................................................................ 13 Variable Declaration in C ................................ Error! Bookmark not defined. Variable Initialization in C ............................... Error! Bookmark not defined.

Lvalues and Rvalues in C ............................................................................. 15

C Constants and Literals ........................................................ 17

Integer literals ............................................................................................ 17

Floating-point literals .................................................................................. 18

Character constants .................................................................................... 18

iii

String literals .............................................................................................. 19

Defining Constants ..................................................................................... 19

The #define Preprocessor ...................................................................... 19

The const Keyword ................................................................................. 20

C Storage Classes ................................................................. 22

The auto Storage Class ................................................................................ 22

The register Storage Class ........................................................................... 22

The static Storage Class ............................................................................... 23

The extern Storage Class ............................................................................. 24

C Operators ........................................................................... 25

Arithmetic Operators .................................................................................. 25

Relational Operators................................................................................... 26

Logical Operators ....................................................................................... 28

Bitwise Operators ....................................................................................... 29

Assignment Operators ................................................................................ 31

Misc Operators հ sizeof & ternary .............................................................. 33

Operators Precedence in C .......................................................................... 33

Decision Making in C.............................................................. 35

if statement ............................................................................................... 36

Syntax ..................................................................................................... 36

Flow Diagram .......................................................................................... 36

Example .................................................................................................. 36

if...else statement ...................................................................................... 37

Syntax ..................................................................................................... 37

Flow Diagram .......................................................................................... 38

Example .................................................................................................. 38

The if...else if...else Statement ..................................................................... 39

Syntax ..................................................................................................... 39

Example .................................................................................................. 39

Nested if statements .................................................................................. 40

Syntax ..................................................................................................... 40

Example .................................................................................................. 40

switch statement ....................................................................................... 41

Syntax ..................................................................................................... 41

Flow Diagram .......................................................................................... 42

Example .................................................................................................. 42

Nested switch statements ........................................................................... 43

Syntax ..................................................................................................... 43

Example .................................................................................................. 43

iii

The ? : Operator ......................................................................................... 44

C Loops .................................................................................. 45

while loop in C ........................................................................................... 46

Syntax ..................................................................................................... 46

Flow Diagram .......................................................................................... 46

Example .................................................................................................. 47

for loop in C ............................................................................................... 47

Syntax ..................................................................................................... 47

Flow Diagram .......................................................................................... 48

Example .................................................................................................. 48

do...while loop in C ..................................................................................... 49

Syntax ..................................................................................................... 49

Flow Diagram .......................................................................................... 50

Example .................................................................................................. 50

nested loops in C ........................................................................................ 51

Syntax ..................................................................................................... 51

Example .................................................................................................. 52

break statement in C .................................................................................. 53

Syntax ..................................................................................................... 53

Flow Diagram .......................................................................................... 53

Example .................................................................................................. 54

continue statement in C .............................................................................. 54

Syntax ..................................................................................................... 54

Flow Diagram .......................................................................................... 55

Example .................................................................................................. 55

goto statement in C .................................................................................... 56

Syntax ..................................................................................................... 56

Flow Diagram .......................................................................................... 56

Example .................................................................................................. 57

The Infinite Loop ........................................................................................ 57

C Functions ............................................................................ 59

Defining a Function .................................................................................... 59

Example .................................................................................................. 60

Function Declarations ................................................................................. 60

Calling a Function ....................................................................................... 60

Function Arguments ................................................................................... 61

Function call by value ............................................................................. 62

Function call by reference ....................................................................... 63

C Scope Rules ....................................................................... 65 iii

Local Variables ........................................................................................... 65

Global Variables ......................................................................................... 66

Formal Parameters ..................................................................................... 67

Initializing Local and Global Variables ........................................................... 67

C Arrays ................................................................................. 69

Declaring Arrays ......................................................................................... 69

Initializing Arrays ........................................................................................ 70

Accessing Array Elements ............................................................................ 70

Multi-dimensional Arrays ............................................................................ 71

Two-Dimensional Arrays ............................................................................. 71

Initializing Two-Dimensional Arrays .............................................................. 72

Accessing Two-Dimensional Array Elements ................................................. 72 Passing Arrays as Function Arguments .......................................................... 73

Way-1 ...................................................................................................... 73

Way-2 ...................................................................................................... 74

Way-3 ....................................................................................................... 74

Example .................................................................................................. 74

Return array from function.......................................................................... 75

Pointer to an Array ..................................................................................... 77

C Pointers .............................................................................. 79

What Are Pointers? .................................................................................... 80

How to use Pointers? .................................................................................. 80

NULL Pointers in C ...................................................................................... 81

Pointer arithmetic ...................................................................................... 81

Incrementing a Pointer ............................................................................... 82

Decrementing a Pointer .............................................................................. 83

Pointer Comparisons .................................................................................. 83

Array of pointers ........................................................................................ 84

Pointer to Pointer ....................................................................................... 86

Passing pointers to functions ....................................................................... 87

Return pointer from functions ..................................................................... 88

C Strings ................................................................................ 91 C Structures ........................................................................... 94

Defining a Structure .................................................................................... 94

Accessing Structure Members ..................................................................... 95 Structures as Function Arguments ............................................................... 96

Pointers to Structures ................................................................................. 97

C Unions .............................................................................. 100

Defining a Union ...................................................................................... 100

iii Accessing Union Members ........................................................................ 101 Bit Fields .............................................................................. 103

Bit Field Declaration ................................................................................. 104

Typedef ................................................................................ 106

typedef vs #define .................................................................................... 107

Input & Output ...................................................................... 108

The Standard Files .................................................................................... 108

The getchar() & putchar() functions ........................................................... 108

The gets() & puts() functions ..................................................................... 109

The scanf() and printf() functions ............................................................... 110

File I/O ................................................................................. 111

Opening Files ........................................................................................... 111

Closing a File ............................................................................................ 112

Writing a File ........................................................................................... 112

Reading a File........................................................................................... 113

Binary I/O Functions ................................................................................. 114

Preprocessors ...................................................................... 115

Preprocessors Examples ............................................................................ 115

Predefined Macros ................................................................................... 116

Preprocessor Operators ............................................................................ 117

Macro Continuation (\) .......................................................................... 117

Stringize (#) ........................................................................................... 117

Token Pasting (##)................................................................................ 118

The defined() Operator ......................................................................... 118

Parameterized Macros .............................................................................. 119

Header Files ......................................................................... 120

Include Syntax .......................................................................................... 120

Include Operation .................................................................................... 121

Once-Only Headers .................................................................................. 121

Computed Includes................................................................................... 122

Type Casting ........................................................................ 123

Integer Promotion .................................................................................... 124

Usual Arithmetic Conversion ..................................................................... 124

Error Handling ...................................................................... 126

The errno, perror() and strerror() ............................................................... 126

Divide by zero errors ................................................................................ 127

Program Exit Status .................................................................................. 128

Recursion ............................................................................. 129

Number Factorial ..................................................................................... 129

iii

Fibonacci Series ....................................................................................... 130

Variable Arguments .............................................................. 131 Memory Management .......................................................... 133 Allocating Memory Dynamically ................................................................. 133 Resizing and Releasing Memory ................................................................. 134 Command Line Arguments ................................................... 136

TUTORIALS POINT

Simply Easy Learning Page 1

C Language Overview

This chapter describes the basic details about C programming language, how it emerged, what are strengths of C and why we should use C. The C programming language is a general-purpose, high-level language that was originally developed by Dennis M. Ritchie to develop the UNIX operating system at Bell Labs. C was originally first implemented on the DEC PDP-11 computer in 1972. In 1978, Brian Kernighan and Dennis Ritchie produced the first publicly available description of C, now known as the K&R standard. The UNIX operating system, the C compiler, and essentially all UNIX applications programs have been written in C. The C has now become a widely used professional language for various reasons.

Easy to learn

Structured language

It produces efficient programs.

It can handle low-level activities.

It can be compiled on a variety of computer platforms.

Facts about C

C was invented to write an operating system called UNIX. C is a successor of B language, which was introduced around 1970. The language was formalized in 1988 by the American National Standard Institute. (ANSI).

The UNIX OS was totally written in C by 1973.

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Today, C is the most widely used and popular System Programming Language. Most of the state-of-the-art softwares have been implemented using C. Today's most ][popular Linux OS and RBDMS MySQL have been written in C.

Why to use C?

C was initially used for system development work, in particular the programs that make up the operating system. C was adopted as a system development language because it produces code that runs nearly as fast as code written in assembly language. Some examples of the use of C might be:

Operating Systems

Language Compilers

Assemblers

Text Editors

Print Spoolers

Network Drivers

Modern Programs

Databases

Language Interpreters

Utilities

C Programs

A C program can vary from 3 lines to millions of lines and it should be written into one or more text files with extension ".c"; for example, hello.c. You can use "vi", "vim" or any other text editor to write your C program into a file. This tutorial assumes that you know how to edit a text file and how to write source code using any programming language.

TUTORIALS POINT

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C Environment Setup

This section describes how to set up your system environment before you start doing your programming using C language. Before you start doing programming using C programming language, you need the following two softwares available on your computer, (a) Text Editor and (b) The C Compiler.

Text Editor

This will be used to type your program. Examples of few editors include Windows Notepad, OS Edit command, Brief, Epsilon, EMACS, and vim or vi. Name and version of text editor can vary on different operating systems. For example, Notepad will be used on Windows, and vim or vi can be used on windows as well as Linux or UNIX.

The files you create with your editor are called source files and contain program source

code. The source files for C programs are typically named with the extension ³.c´. Before starting your programming, make sure you have one text editor in place and you have enough experience to write a computer program, save it in a file, compile it and finally execute it.

The C Compiler

The source code written in source file is the human readable source for your program. It needs to be "compiled", to turn into machine language so that your CPU can actually execute the program as per instructions given. This C programming language compiler will be used to compile your source code into final executable program. I assume you have basic knowledge about a programming language compiler. Most frequently used and free available compiler is GNU C/C++ compiler, otherwise you can have compilers either from HP or Solaris if you have respective Operating Systems. Following section guides you on how to install GNU C/C++ compiler on various OS. I'm mentioning C/C++ together because GNU gcc compiler works for both C and C++ programming languages.

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Installation on UNIX/Linux

If you are using Linux or UNIX, then check whether GCC is installed on your system by entering the following command from the command line: $ gcc -v If you have GNU compiler installed on your machine, then it should print a message something as follows:

Using built-in specs.

Target: i386-redhat-linux

Configured with: ../configure --prefix=/usr .......

Thread model: posix

gcc version 4.1.2 20080704 (Red Hat 4.1.2-46) If GCC is not installed, then you will have to install it yourself using the detailed instructions available athttp://gcc.gnu.org/install/ This tutorial has been written based on Linux and all the given examples have been compiled on Cent OS flavor of Linux system.

Installation on Mac OS

If you use Mac OS X, the easiest way to obtain GCC is to download the Xcode development environment from Apple's web site and follow the simple installation instructions. Once you have Xcode setup, you will be able to use GNU compiler for C/C++. Xcode is currently available at developer.apple.com/technologies/tools/.

Installation on Windows

To install GCC at Windows you need to install MinGW. To install MinGW, go to the MinGW homepage, www.mingw.org, and follow the link to the MinGW download page. Download the latest version of the MinGW installation program, which should be named MinGW- .exe. While installing MinWG, at a minimum, you must install gcc-core, gcc-g++, binutils, and the MinGW runtime, but you may wish to install more. Add the bin subdirectory of your MinGW installation to your PATH environment variable, so that you can specify these tools on the command line by their simple names. When the installation is complete, you will be able to run gcc, g++, ar, ranlib, dlltool, and several other GNU tools from the Windows command line.

TUTORIALS POINT

Simply Easy Learning Page 5

C Program Structure

IHP·V ORRN LQPR +HOOR JRUOG H[MPSOH XVLQJ F 3URJUMPPLQJ IMQJXMJHB Before we study basic building blocks of the C programming language, let us look a bare minimum C program structure so that we can take it as a reference in upcoming chapters.

C Hello World Example

A C program basically consists of the following parts:

Preprocessor Commands

Functions

Variables

Statements & Expressions

Comments

Let us look at a simple code that would print the words "Hello World": #include int main() /* my first program in C */ printf("Hello, World! \n"); return 0;

Let us look various parts of the above program:

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1. The first line of the program #include is a preprocessor command, which tells

a C compiler to include stdio.h file before going to actual compilation.

2. The next line int main() is the main function where program execution begins.

3. The next line /*...*/ will be ignored by the compiler and it has been put to add additional

comments in the program. So such lines are called comments in the program.

4. The next line printf(...) is another function available in C which causes the message

"Hello, World!" to be displayed on the screen.

5. The next line return 0; terminates main()function and returns the value 0.

Compile & Execute C Program

are the simple steps:

1. Open a text editor and add the above-mentioned code.

2. Save the file as hello.c

3. Open a command prompt and go to the directory where you saved the file.

4. Type gcc hello.c and press enter to compile your code.

5. If there are no errors in your code, the command prompt will take you to the next line and

would generate a.out executable file.

6. Now, type a.out to execute your program.

7. You will be able to see "Hello World" printed on the screen

$ gcc hello.c $ ./a.out

Hello, World!

Make sure that gcc compiler is in your path and that you are running it in the directory containing source file hello.c.

TUTORIALS POINT

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C Basic Syntax

This chapter will give details about all the basic syntax about C programming language including tokens, keywords, identifiers, etc. You have seen a basic structure of C program, so it will be easy to understand other basic building blocks of the C programming language.

Tokens in C

A C program consists of various tokens and a token is either a keyword, an identifier, a constant, a string literal, or a symbol. For example, the following C statement consists of five tokens: printf("Hello, World! \n");

The individual tokens are:

printf "Hello, World! \n"

Semicolons ;

In C program, the semicolon is a statement terminator. That is, each individual statement must be ended with a semicolon. It indicates the end of one logical entity. For example, following are two different statements: printf("Hello, World! \n"); return 0;

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Comments

Comments are like helping text in your C program and they are ignored by the compiler. They start with /* and terminates with the characters */ as shown below: /* my first program in C */ You cannot have comments within comments and they do not occur within a string or character literals.

Identifiers

A C identifier is a name used to identify a variable, function, or any other user-defined item. An identifier starts with a letter A to Z or a to z or an underscore _ followed by zero or more letters, underscores, and digits (0 to 9). C does not allow punctuation characters such as @, $, and % within identifiers. C is a case sensitive programming language. Thus, Manpower and manpower are two different identifiers in C. Here are some examples of acceptable identifiers: mohd zara abc move_name a_123 myname50 _temp j a23b9 retVal

Keywords

The following list shows the reserved words in C. These reserved words may not be used as constant or variable or any other identifier names. auto else Long switch break enum register typedef case extern return union char float short unsigned const for signed void continue goto sizeof volatile default if static while do int struct _packed double

TUTORIALS POINT

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Whitespace in C

A line containing only whitespace, possibly with a comment, is known as a blank line, and a

C compiler totally ignores it.

Whitespace is the term used in C to describe blanks, tabs, newline characters and comments. Whitespace separates one part of a statement from another and enables the compiler to identify where one element in a statement, such as int, ends and the next element begins. Therefore, in the following statement: int age; There must be at least one whitespace character (usually a space) between int and age for the compiler to be able to distinguish them. On the other hand, in the following statement: fruit = apples + oranges; // get the total fruit No whitespace characters are necessary between fruit and =, or between = and apples, although you are free to include some if you wish for readability purpose.

TUTORIALS POINT

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C Data Types

In the C programming language, data types refer to an extensive system used for declaring variables or functions of different types. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted.

The types in C can be classified as follows:

S.N. Types and Description

1

Basic Types:

They are arithmetic types and consists of the two types: (a) integer types and (b) floating- point types. 2

Enumerated types:

They are again arithmetic types and they are used to define variables that can only be assigned certain discrete integer values throughout the program.

3 The type void:

The type specifier void indicates that no value is available. 4

Derived types:

They include (a) Pointer types, (b) Array types, (c) Structure types, (d) Union types and (e) Function types. The array types and structure types are referred to collectively as the aggregate types. The type of a function specifies the type of the function's return value. We will see basic types in the following section, whereas, other types will be covered in the upcoming chapters.

Integer Types

Following table gives you details about standard integer types with its storage sizes and value ranges:

Type Storage size Value range

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