listing3.3.cpp displaying multiplication number from MultiplyNumber() and from main()

// listing3.3.cpp
#include <iostream>
using namespace std;

//declare 3 global integers
int firstNumber=0;
int secondNumber=0;
int multiplicationResult=0;

void MultiplyNumber()
{
    cout << "Enter 1st number: ";
    cin >> firstNumber;

    cout << "Enter 2nd number: ";
    cin >> secondNumber;

    multiplicationResult=firstNumber*secondNumber;

    //display result
    cout << "displaying from MultiplyNumber(): ";
    cout << firstNumber << " * " << secondNumber;
    cout << " = " << multiplicationResult << endl;
}

int main()
{
    cout << "this program multiply 2 numbers.\n";

    //call function MultiplyNumber()
    MultiplyNumber();

    cout << "displaying from main(): ";


    cout << firstNumber << " * " << secondNumber;
    cout << " = " << multiplicationResult << endl;

    return 0;
}

output:

 

this program multiply 2 numbers.
Enter 1st number: 7
Enter 2nd number: 9
displaying from MultiplyNumber(): 7 * 9 = 63
displaying from main(): 7 * 9 = 63

Process returned 0 (0x0)   execution time : 6.303 s
Press any key to continue.