num.cpp

#include <iostream>
#include <conio>

using namespace std;

int main()
{
    long a = 0;
    int b = 0;
    
    clrscr();
    
    cout << "sum of digits of input number" << endl;
    cout << "enter a number" << endl;
    
    cin >> a;
    
    while(a!=0){
        b = b+(a%10);
        a = a/10;
    }
    
    cout << "required sum:" << b;
    
    getch();
    
    return 0;
}