C :

#include<stdio.h>
#include "string.h"
#include<stdlib.h>

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

	return 0;
}

C++ :

#include <iostream>
using namespace std;
int main(){
    int a,b;
    while(cin >> a >> b)
        cout << a+b << endl;
	return 0;
}

Java :

import java.util.*;
public class Main{
	public static void main(String args[]){
		Scanner cin = new Scanner(System.in);
		int a, b;
		while (cin.hasNext()){
			a = cin.nextInt(); b = cin.nextInt();
			System.out.println(a + b);
		}
	}
}