While Loop in C language

-

While loop 

While loop is also known as Entry Control loop because condition is checked at the entry of loop.

syntax

while(condition)
{
statement; 
Increment/decrement;
}

Program1-Write a program to print 0to 10 number using while loop 

code-
#include<stdio.h>
void main()
{
int i=0,number=10;
while(i<=10)
{
printf("%d\n",i);
i++;
}
}
Output
0
1
2
3
4
5
6
7
8
9
10
---------------------------------------------------------------------------------

program2-write a program to find out the factorial of number using while loop.
code-
#include<stdio.h>
void main()
{
int fact=1,i=1,number;
printf("Enter a number to find factorial:");
scanf("%d",&number);
while(i<=number)
{
fact=fact*i;
i++;
}
printf("The factorial of %d is %d",number,fact);
output-
Enter a number to find factorial:5
The factorial of 5 is 120
--------------------------------------------------------------------------------------------
program3-write a program to find sum of digit any number using while loop.
code-
#include<stdio.h>
void main()
{
    int sum=0,digit,no;
    printf("Enter a number");
    scanf("%d",&no);
while(no!=0)
{
digit=no %10;
sum=sum+digit;
no=no/10;
} 
printf("The sum of digit of number is: %d",sum);
}
output- Enter a number8963
The sum of digit of number is: 26
---------------------------------------------------------------------------------------------------------
 program4-write a program to find reverse of  input number using while loop
code- 
#include<stdio.h>
void main()
{       
        int rev=0,digit,no;
        printf("Enter a number to find the Reverse");
        scanf("%d",&no);
while(no!=0)
{
digit=no %10;
rev=rev*10+digit;
no=no/10;
} 
printf("Reverse of the number is %d",rev );
}
output-
Enter a number to find the Reverse 4596
Reverse of the number is 6954
---------------------------------------------------------------------------------------------------------
program5-write a program to find input number is palindrome number or not using while loop 
code-
#include<stdio.h>
void main()
{     
        int rev=0,digit,no,copy;
        printf("Enter a number ");
        scanf("%d",&no);
        copy=no;

while(no!=0)
{   digit=no %10;
rev=rev*10+digit;
no=no/10;
} 
if(rev==copy)
{printf("Enter number is the Palindrome");
}
else
printf("Enter number is not  Palindrome ");
}
output-
Enter a number 12355321
Enter number is the Palindrome
---------------------------------------------------------------------------------------------

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