It outputs '56' to your console. That's all.

56.cpp

#include <iostream>

int math_fact(int n) {
    int r = 1;
    for (; n > 0; n--) {
        r *= n;
    }
    return r;
}

int main() {
    // 8!/(8-2)! == _8 P _2
    int res = math_fact(8) / math_fact(8 - 2);
    std::cout << res;
    return 0;
}

56.php

<?php
function math_fact($n) {
    $r = 1;
    for (; $n > 0; $n--) {
        $r *= $n;
    }
    return $r;
}

// 8!/(8-2)! == _8 P _2
$res = math_fact(8) / math_fact(8 - 2);
print $res;
?>

56.py

import math

# 8!/(8-2)! == _8 P _2
res = math.factorial(8) // math.factorial(8 - 2)
print(res)

Print56.java

public class Print56 {
    public static void main(String args[]) {
        // 8!/(8-2)! == _8 P _2
        int res = math_fact(8) / math_fact(8 - 2);
        System.out.print(res);
    }

    static int math_fact(int n) {
        int r = 1;
        for (; n > 0; n--) {
            r *= n;
        }
        return r;
    }
}