C :

#include <stdio.h>
main()
{
  int a,b;
  while(scanf("%d%d",&a,&b)&&(a||b))
   {

      printf("%d\n",a+b);
   }
return 0;

}

C++ :

#include <iostream>
#include <cstdio>

int main() {
        int a, b;
        while (scanf("%d%d", &a, &b) != EOF)
        {
                if (a == 0 && b == 0) break;  
             printf("%d\n", a + b);
         }
        return 0;
}

Pascal :

program p1002;
var a,b:longint;
begin
  while not eof do 
    begin
      readln(a,b);
      if not((a=0) and (b=0)) then
        writeln(a+b);
    end;
end.     

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		final int MAX=1024;
		int i = 0;
		@SuppressWarnings("resource")
		Scanner in = new Scanner(System.in);
		int[] a =new int[MAX];
		int[] b =new int[MAX];
		a[i] = in.nextInt();
		b[i] = in.nextInt();
		while(a[i] != 0 && b[i] != 0){
			i++;
			a[i] = in.nextInt();
			b[i] = in.nextInt();
		}
		
		for(int j = 0; j < i; j++){
			System.out.println(a[j]+b[j]);
		}
	}
}

Python :

import sys
for line in sys.stdin:
    a = line.split()
    if int(a[0]) !=0 and int(a[1]) !=0:
       print int(a[0]) + int(a[1])