C-Program for Sum of all digits in a number

#include<stdio.h>

int main()

{

 int dummy,n,sum=0,x;

 printf("Enter a number\n");

 scanf("%d",&n);

 dummy=n;

 while(n>0)

 {

   x=n%10;

   sum=sum+x;

   n=n/10;

 }

 printf("The sum of all digits in %d is %d\n",dummy,sum);

return 0;

}