C :

#include<stdio.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 pl(int &a,int &b)
{
	int s=0;
	s=a+b;
	return s;
}
int main()
{
	int a,b,m,n;
	cin>>a>>b;
	cin>>m>>n;
	pl(a,b);
	pl(m,n);
	cout<<pl(a,b);
	cout<<endl;
	cout<<pl(m,n);
}

Pascal :

var a,b:longint;
begin
  while not eof do
      begin
         readln(a,b);
        writeln(a+b);
      end;
 end.

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);
		}
	}
}