While loop in C

January 17, 2023

Introduction of while loop in C

In C, while loop is defined as the conditional statement which allows to run the blocks of code in a defined number or infinite number of times. Basically the while loop is used to run the run in repetitive times until the condition is true.

While loop in C

Syntax:

while(condition)
{
   // initialization
   blocks of Code
   // updation
}

Algorithm:

  • Step 1: Start
  • Step 2: Initialize the value
  • Step 3: check the condition
  • Step 4: If true, execute the statements and repeat from step 3
  • Step 5: If false, break the loop
  • Step 6: Stop/End
While loop in C
C tutorial desk gif

if else statement

Conditional statement Program

Decision Making Statements

do while

For Loop

Example 1

Run

#include <stdio.h>

int main()

{
  int i=1;  //intialization 
 
  while(i<=5)
    {
    printf("PrepInsta\n");
    i++;  //updation
    }

return 0;
}

Output:

PrepInsta
PrepInsta
PrepInsta
PrepInsta
PrepInsta

Working of while loop

Initialization:

  • It is the starting statement of the while loop which accepts the initialization of expression.

Conditional Statement:

  • A conditional statement determines whether the block of code will be executed or not. 
  • When the condition is satisfied, the loop will end. It will continue to test the condition and check until the block of code under the while loop is satisfied.

Body:

  • It is the main part of the code which needs to be executed in every iteration for performing the given condition.
  • It refers to a collection of statements which includes variable functions etc.

Updation:

  • It is the statement of the while loop which includes the increment and decrement expression according to the conditional statement.

Example 2

Run

#include <stdio.h>

int main()
{
  int i = 1;  //initialization

  while (i <= 10)
  {
    printf("%d\n", i);
    i++;  //updation
  }

return 0;
}

Output:

1
2
3
4
5
6
7
8
9
10

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