Last updated on:May 26th, 2018,

While loop Cplusplus

What is while loop?

While loop have the following properties;

  • Conditional loop structure
  • Executes the statements until the given condition remains true. Stop the loop when given condition false.

When to use while loop?

  • When programmer does not know in advance the total number of repetitions of loop.

What is the syntax of while loop?

Syntax
While (condition)

{

statements;

Loop increment;

}

Example:

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2

3

4

5

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7

8

9

10

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13

 

#include<iostream>

using namespace std;

int main()

{

int number=1;

while(number<=10)

{

cout<<“number is “<<number<<endl;

number++;

}

cout<<“you are outside the loop”;

}

              

 

Output:
number is 1

number is 2

number is 3

number is 4

number is 5

number is 6

number is 7

number is 8

number is 9

number is 10

you are outside the loop

Line 5:

  • Integer type loop variable “number” is declared and initialized with value 1.

Line 6:

  • There is a condition that loop will execute if value of number variable is less than or equal to 10.

Line 7:

  • Start of loop

Line 9:

  • Value of loop variable number is incremented.

 

Test Your Understandings
1. If the given condition is false then no statement execute in while section? True / False
Answer - Click Here:
True
while(number<=10);

{

cout<<“number is “<<number<<endl;

number++;

}

2. What is the error in code above?

Answer - Click Here:
Error: while(number<=10);

Correct: while(number<=10)

 

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