Program:

#include <stdio.h>
int main(){
int n,Original_num,sum=0,d;

printf("Enter the Number:");
scanf("%d",&n);
    Original_num=n;

    while(n!=0){
    d=n%10;
    sum=sum+d;
    n/=10;
    }
    printf("\n\t-->> Sum Of the Digit of %d is %d . \n",Original_num,sum);
}

Expected O/P:

Enter the Number:134

-->> Sum Of the Digit of 134 is 8 .