Write a program to calculate sum of digits

 Write a program to calculate sum of digits 

#include<iostream>

using namespace std;

int main()

{

    int n,a,sum=0;

    cout <<"enter the number: ";

    cin>>n;

    while(n!=0)

    {

        a=n%10;

        sum=sum+a;

        n=n/10;

    }

    cout<<"sum of digits: "<<sum;

    return 0;

}