While Loop in C Language

Hello friends how are you, today in this blog i will teach you what is while loop statement, syntax of while loop , how while loop statement works and many programs using while loop statement in a very simple way.

Let's start

To run the particular block of code continuously until a required condition is fulfill is called looping. It is used to perform looping operation. When the condition will become false the execution of loop will be stopped.

👉Syntax

Its body will execute until the given condition is true.

👉Example 1 

#include<stdio.h>
int main()
{
int i=1;
while(i<=10)
{
 printf("%d ",i);
 i++;
}
}
/*
### output ###
1 2 3 4 5 6 7 8 9 10
*/

In the above program i is a variable which is initialized with 1,condition goes to 10 and it is incremented by 1 so the output will be 1 to 10.

👉Program: Factorial program 

The product of all positive number which is less than or equal to a given positive number is called factorial of that number.

For example if we want to find factorial of 5 then it will be product of 1,2,3,4 and 5.

 

To make a factorial program we will take three variables , one for number , second for running loop and third one for  storing the product of numbers.

After taking user input of number we will run loop from 1 to number itself and then we will find product of number from 1 to number and store it to a variable.

After multiplying number from 1 to number we will print the product as a output of program.

#include<stdio.h>
int main()
{
 //variables declaration
 int no,fact=1,i=1;
 //taking user input
 printf("Enter any number\n");
 scanf("%d",&no);
 //loop for multiplying numbers
 while(i<=no)
 {
 	//incrementing factor count
 	fact=fact*i;
 	//incrementing loop
 	i++;
 }
 //printing result
 printf("Factorial of %d is %d",no,fact);
 
}
/*
###Output###
Enter any number
5
Factorial of 5 is 120
*/

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