Simple Calculator With 2 Input and Using Functions

#include <iostream>
using namespace std;

int Add(int, int);
int Substract(int, int);
int Multiply(int, int);
int Divide(int, int);

int main() {
    int firstnum, secondnum;
    char arithmetic_operations;

    cout << "Enter first number: ";
    cin >> firstnum;

    cout << "Enter second number: ";
    cin >> secondnum;

    cout << "Enter Arithmetic Operations (+, -, *, /): ";
    cin >> arithmetic_operations;

    if (arithmetic_operations == '+')
        cout << firstnum << " + " << secondnum << " = " << Add(firstnum, secondnum) << endl;
    else if (arithmetic_operations == '-')
        cout << firstnum << " - " << secondnum << " = " << Substract(firstnum, secondnum) << endl;
    else if (arithmetic_operations == '*')
        cout << firstnum << " * " << secondnum << " = " << Multiply(firstnum, secondnum) << endl;
    else if (arithmetic_operations == '/')
        cout << firstnum << " / " << secondnum << " = " << Divide(firstnum, secondnum) << endl;
    else
        cout << "You typed an invalid arithmetic operations!\n";
    return 0;
}

int Add(int firstnum, int secondnum) {
    return firstnum + secondnum;
}

int Substract(int firstnum, int secondnum) {
    return firstnum - secondnum;
}

int Multiply(int firstnum, int secondnum) {
    return firstnum * secondnum;
}

int Divide(int firstnum, int secondnum) {
    return firstnum / secondnum;
}