Return_keyword.cpp

#include <iostream>

double square(double length);
double cube(double length);
std::string concatStrings(std::string string1, std::string string2);

int main() {
    // return = return a value back to the spot
    //          where you called the encompassing function

    double length;

    std::string firstName = "Yutak";
    std::string lastName = "Choi";

    std::cout << "Enter a length: ";
    std::cin >> length;

    double area = square(length);
    double volume = cube(length);
    std::string fullName = concatStrings(firstName, lastName);

    std::cout << "Area: " << area << "cm^2\n";
    std::cout << "Volume: " << volume << "cm^3\n";
    std::cout << "Hello " << fullName << "\n";

    return 0;
}

double square(double length) {
    return length * length;
}

double cube(double length) {
    return length * length * length;
}

std::string concatStrings(std::string string1, std::string string2) {
    return string1 + " " + string2;
}