/*
    demoFunc.cpp
    Dave Klick
    CIS 150
    2018-02-27

    Demonstrates functions
*/

#include <string>
#include <iostream>
using namespace std;

void display(string msg);
void display(int num, string msg);
int factorial(int n);
double calcArea(double len, double wid);
double getDouble(string prompt, double min, double max);

int main() {
    double length, width;
    display("It's a great night tonight!");
    display(4, "Sometimes I stutter.");
    cout << "5! is " << factorial(5) << endl;
    length = getDouble("Enter the length (1-35): ", 1, 35);
    width = getDouble("Enter the width (5-25): ", 5, 25);
    cout << "The area is " << calcArea(length, width) << endl;
    return 0;
}

void display(string msg) {
    cout << msg << endl;
}

void display(int num, string msg) {
    for (int i=1; i<=num; i++) {
        cout << msg << endl;
    }
}

int factorial(int n) {
    int prod = 1;
    for (int i=1; i<=n; i++) {
        prod = prod * i;
    }
    return prod;
}

double calcArea(double len, double wid) {
    return len * wid;
}

double getDouble(string prompt, double min, double max) {
    double num;
    cout << prompt;
    cin >> num;
    while (num < min || num > max) {
        cout << "Number out of range\n";
        cout << prompt;
        cin >> num;
    }
    return num;
}