[PDF] Lecture 3 Cont Java Console Input/Output The Basics PDF Lecture3

17 jan 2020 · Use this object to call functions print, println, and even printf ▷ print() System out printf(format string, list of parameters); ▷ The format string

Java printf( ) Method Quick Reference System out printf( “format-string” [, arg1, arg2, ] ); Format String: Composed of literals and format specifiers [flags] [width] [ precision] conversion-character ( square brackets denote optional parameters ) Flags: - : left-justify ( default is to right-justify ) Width:

[PDF] printf

format • The Java method printf is similar to the print method – Like print, printf does not advance the output to the next line • System out printf can have any

[PDF] format string - Building Java Programs

Formatting text with printf System out printf("format string", parameters); A format string can contain placeholders to insert parameters: d integer f

[PDF] Input and Formatted Output (printf)

11 fév 2020 · – Put the import statement at the top of the Java file – Create a Scanner object, as shown in the first line of the main method: Scanner in = new

[PDF] A popular way of formatting output in Java is the print format function

The remaining parameters, i e , the arguments, are the values to be printed out Unit 3 - Introduction to Java 84 System out printf(“String”, [arguments]);

[PDF] The printf

Floating point (decimal notation) printf Worksheet 1 System out printf( " +3d", 674); 2 System out printf( " $ 2 2f ",6 4); 3 String p = " 3 1f"; double q=3 567;

[PDF] JavaioPrintStreamprintf() Method Example - Tutorialspoint

printf method is a convenience method to write a formatted string to this output stream using the specified format string and arguments Following is the declaration for java io PrintStream

[PDF] Lecture 3 Cont Java Console Input/Output The Basics

17 jan 2020 · Use this object to call functions print, println, and even printf ▷ print() System out printf(format string, list of parameters); ▷ The format string

[PDF] Looping Paradigms Systemoutprintf

7 sept 2011 · System out printf • Prints formatted text – Useful for indentations, tabs, formatting doubles, etc System out printf(, )

[PDF] The DecimalFormat Class Java has a default way of displaying

The Java API provides a class to do this called DecimalFormat You create a Here's a quick summary of the available printf format specifiers: c character

Lecture 3 Cont.

Java Console Input/Output

The Basics

CGS3416 Spring 2020

January 17, 2020

Console Output

I System.out{outis aPrintStreamobject, a static data member of classSystem. This represents standard output I Use this object to call functionsprint, println,and evenprintf I print(){ converts parameter to a string (if not already one) and prints it out Iprintln(){ prints parameter, and also prints a newline after Iprintf{ works like in C programming. Formatted string, followed by parameters to "ll in the blanks"

Sample Calls

System.out.print("Hello, World"); // no newline

System.out.println("Hello World");

// adds newline at end int feet = 6, inches = 3; System.out.printf("I am %d feet and %d inches tall\n", feet, inches); // just like printf in C

Concatenation

If the + operator is used with at least one string operand, then the operation is string concatenation. Other types will be auto-converted to type string if needed System.out.println("The number of states in the U.S. is " + 50); int sides = 8;

System.out.println("Number of sides on a stop

sign = " + sides);

Formatting with printf

I When printing values with decimal precision it is often useful to be able to specify how many decimal places should be printed I

Format of printf calls:

System.out.printf(format string, list of parameters); I The format string is a string in quotes, with special format symbols inserted: I %d species an integer

I%c species a character

I%s species a String

I%f species a

oating point type I Consider the format symbols to be \ll-in-the-blanks" spots in the format string. These are lled in with the list of parameters printf Example int numStudents = 25; char letterGrade = 'A'; double gpa = 3.95;

System.out.printf("There are %d students\n",

numStudents); System.out.printf("Bobby's course grade was %c, and his GPA is %f\n", letterGrade, gpa); // The output from this example is: // There are 25 students // Bobby's course grade was A, and his GPA is 3.950000 printf Example To specify how many decimal places for the output of a oating point value, modify the `%f' symbol in this format: %.Nf // where N is the number of decimal places

Example:

double gpa = 3.275; double PI = 3.1415;

System.out.printf("gpa = %.2f", gpa);

System.out.printf("PI = %.3f", PI);

// Output is: // gpa = 3.28 // PI = 3.142

Console Input

I Before Java version 1.5.0, console input was harder. Since

1.5.0, we have theScannerclass

I class Scanner is a text parser. Contains easy methods for grabbing dierent types of input I

System.inis anInputStreamobject that represents

standard input I

To useScannerto read from standard input:

1. Put the app ropriateimp ortstatement a tthe top of the le: import java.util.Scanner; 2.

Create a Scanner object

P assin System.ininto theScannerconstructor, when

creating the object

Example

import java.util.Scanner; // yadda yadda

Scanner input = new Scanner(System.in);

// now we can use the object to read data from // the keyboard (stdin). // Some sample calls: int x = input.nextInt(); double y = input.nextDouble();

String s = input.next();

Reading dierent types of input

Dierent data types require the use of dierent methods available in theScannerclass. These are available only for primitive types and Strings. For the following table, assume theScannerobject is called"in".TypeReading in one variable intint i = in.nextInt(); longlong l = in.nextLong(); oat oat f = in.nextFloat(); doubledouble d = in.nextDouble(); booleanboolean bool = in.nextBoolean();

StringString st = in.next();

Reading in chars

I TheScannerclass does not have a method for reading in characters. I However, there are several ways to read in a single character using the Scanner class. I One such way is to read in a String and then grab the rst character.

String st = in.next();

char c = st.CharAt(0);quotesdbs_dbs6.pdfusesText_12

[PDF] [PDF] Lecture 3 Cont Java Console Input/Output The Basics