C :

#include<stdio.h>
int main(){
  int a=123;
  int b=456;
  printf("sum is %d",a+b);
  return 0;
}

C++ :

#include <stdio.h>
int main() {
	int a, b, sum;
	a = 123; b = 456;
	sum = a + b;
	printf("sum is %d\n", sum);
	return 0;
}

Pascal :

begin
  writeln('sum is 579');
end.

Java :

public class Main {
	public static void main(String[] args) {
int a=123;
int b=456;
System.out.print("sum is "+(a+b));
	}
}

Python :

a=123;
b=456;
print "sum is",a+b

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace C语言
{
    class _1_2
    {
        static void Main() {
            int a = 123, b = 456;
            Console.WriteLine("sum is {0}",a+b);
  //          Console.ReadLine();
            return;
        }
    }
}