C++ Program for Sum of Individual Digits of Number

Program 1

//Program for Addition of digit
#include<iostream>
#define clrscr() system("cls")
using namespace std;
int main()
{
      int n,r,s=0,m;
      clrscr();
      cout<<"Enter a number";
      cin>>n; 
      m=n;
      while(n!=0) 
      {
        r=n%10; 
        s=s+r; 
        n=n/10; 
      }
      cout<<"\n Addition of individual digit of:  "<<m<<" is: "<<s;
      return 0;
}