/* C */
#include 

int sum(int* a, int b){
    return *a + b;
}

int main(void){
    int x = 21;
    int y = 21;
    printf("C says: %d\n", sum(&x, y));
    return 0;
}
C 
// C++
#include 
using namespace std;
int main(){
    cout << "Hello, C++ World!" << endl;
    return 0;
}
C++ 
// C#
using System;
class Program{
    static void Main(){
        Console.WriteLine("Hello, C# World!");
    }
}
C#
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