[PDF] [PDF] Arithmetic Operators Arithmetic Operators in C Division

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This tutorial will explain the arithmetic, relational, logical, bitwise, assignment and other operators Following table shows all the arithmetic operators supported by C language Assume variable Modulus Operator and remainder of after an

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In computing, the modulo (sometimes called modulus, or mod) operation "9 mod 3" would evaluate to 0 because the division of 9 by 3 has a quotient of 3 and

[PDF] Arithmetic Operators Arithmetic Operators in C Division

remainder after m is divided by n □ Modulus is an integer operation -- both operands MUST be integers □ Examples : 17 5 = 2 6 3 = 0 9 2 = 1 5 8 = 

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Arithmetic Operators

Topics

Arithmetic Operators Operator Precedence Evaluating Arithmetic Expressions In-class Project Incremental Programming

Reading

Section 2.5

Arithmetic Operators in C

Name Operator Example

Addition +num1 + num2

Subtraction -initial - spent

Multiplication *fathoms * 6

Division /sum / count

Modulus %m % n

Division

If both operands of a division expression are integers, you will get an integer answer. The fractional portion is thrown away. Examples : 17 / 5 = 3

4 / 3 = 1

35 / 9 = 3

Division (con't)

Division where at least one operand is a floating point number will produce a floating point answer. Examples :17.0 / 5 = 3.4

4 / 3.2 = 1.25

35.2 / 9.1 = 3.86813

What happens? The integer operand is temporarily converted to a floating point, then the division is performed.

Division By Zero

Division by zero is mathematically undefined. If you allow division by zero in a program, it will cause a fatal error. Your program will terminate execution and give an error message. Non-fatal errors do not cause program termination, just produce incorrect results.

Modulus

The expression m % n yields the integer remainder after m is divided by n. Modulus is an integer operation -- both operands MUST be integers. Examples :17 % 5 = 2

6 % 3 = 0

9 % 2 = 1

5 % 8 = 5

Used to determine if an integer value is even or odd

5 % 2 = 1 odd 4 % 2 = 0 even

If you take the modulus by 2 of an integer, a

result of 1 means the number is odd and a result of 0 means the number is even. The Euclid's GCD Algorithm (done earlier)

Uses for Modulus

Arithmetic Operators

Rules of Operator Precedence

Evaluated third. If there are several, evaluated

left to right.

Evaluated last, right to left.

Evaluated second. If there are several,

evaluated left to right

Evaluated first. If nested (embedded),

innermost first. If on same level, left to right.

Precedence & AssociativityOperator(s)

Using Parentheses

Use parentheses to change the order in which an expression is evaluated. a + b * cWould multiply b * c first, then add a to the result. If you really want the sum of a and b to be multiplied by c, use parentheses to force the evaluation to be done in the order you want. (a + b) * c Also use parentheses to clarify a complex expression.

Practice With Evaluating Expressions

Given integer variables a, b, c, d, and e,

where a = 1, b = 2, c = 3, d = 4, evaluate the following expressions: a + b - c + d a * b / c

1 + a * b % c

a + d % b - c e = b = d + c / b - a Let's write a program that computes and displays the volume and surface area of a cube. Procedure: Use the pseudocode that we developed in "Algorithms, Part 3 of 3" Convert the algorithm to code Clean up the code (spacing, indentation, commenting)

A Sample Project

The Box - Pseudocode

Display "Enter the height: "

Read

While ( <= 0 )

Display "The height must be > 0"

Display "Enter the height: "

Read

End_while

The Box - Pseudocode (con't)

Display "Enter the width: "

Read

While ( <= 0 )

Display "The width must be > 0"

Display "Enter the width: "

Read

End_while

The Box - Pseudocode (con't)

Display "Enter the depth: "

Read

While ( <= 0 )

Display "The depth must be > 0"

Display "Enter the depth: "

Read

End_while

The Box - Pseudocode (con't)

= X X = X = X = X = 2 X ( + + )

The Box - Pseudocode (con't)

Display "Height = ",

Display "Width = ",

Display "Depth = ",

Display "Volume = ",

Display "Surface Area = ",

Good Programming Practice

It is best not to take the "big bang" approach to coding. Use an incremental approach by writing your code in incomplete, yet working, pieces. For example, for your projects, Don't write the whole program at once. Just write enough to display the user prompt on the screen. Get that part working first (compile and run). Next, write the part that gets the value from the user, and then just print it out.

Always have a working

version of your program!

Good Programming Practice

Get that working (compile and run). Next, change the code so that you use the value in a calculation and print out the answer. Get that working (compile and run). Continue this process until you have the final version. Get the final version working.

Using the Incremental Approach

Let's think about how we could have developed the volume and surface area program incrementally.quotesdbs_dbs5.pdfusesText_10