Code :
#include<iostream>
#include<conio.h>
using namespace std;

int MultiplicationFunction(int, int);

int main() {
    int n1, n2, result;
    cout<<"Enter First Number: ";
    cin>>n1;
    cout<<"Enter Second Number: ";
    cin>>n2;   
    result = MultiplicationFunction(n1, n2);
    cout<<"Result is: "<<result;
}

int MultiplicationFunction(int x, int y) {
    int output;
    output = x * y;
    return output;
}

Output :
Enter First Number: 10
Enter Second Number: 2
Result is:20

IDE Used To Test This Code : DEV C++.

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