#include <iostream>
#include <stdio.h>

using namespace std;

int main(){
    double dNum1 = 0,  dNum2 = 0 , dResult = 0;
    int iChoice = 0;

    startPoint:
        printf("%s n" , "enter 2 numbers : ");
        if( scanf("%d", &dNum1 ) == 1 && scanf("%d" , &dNum2) == 1){
            dResult = dNum1 + dNum2;
            printf("%d " , dResult );

        } else{

            goto startPoint;
        }

    return 0;
}