C program to print sum of digits

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The below program gives the sum of all the digits in a variable using loop. The C printf statement is used to output the text and sum value to the screen.

Logic:

Till the given Number is greater than 0.

Remainder = Modulus of Number with 10
Total Sum = Adding Remainder into the Total Sum
Number = Dividing Number by 10

C program to print sum of digits

#include <stdio.h>
 
void main()
{
int x,y;
int sum = 0;
 
printf("Enter a number to add digits:");    
scanf("%d",&x);   
int num = x;
 
while(x>0)    
{    
y = x % 10;    
sum = sum + y;    
x = x / 10;    
}   
printf("Sum of digits of %d = %d", num,sum);    
}

Output

Enter a number to add digits:123456
Sum of digits of 123456 = 21