// Lecture1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "iostream.h"
#include "stdlib.h"

int factorialr (int n)
{
	if (n == 0)
		return 1;
	else
		return n * factorialr(n-1);
}

int factoriali (int d)
{
	int total = 1;
	for (;d > 0; d--)
		total *= d;
	return total;
}

char* scores (char letter_grade)
{
	switch (tolower(letter_grade)) {
	case 'a' : return "90-100";
	case 'b' : return "80-90";
	case 'c' : return "70-80";
	case 'd' : return "60-70";
	case 'f' : return "<60";
	}
	return "ERROR";
}

float mpg (int miles, int gallons)
{
	return (float(miles) / float(gallons));
}

int main(int argc, char* argv[])
{
	int i, m, g;
	if (argc == 0) {
		cout << "No parameters specified!" << endl;
	}
	else {
		for (i=0; i < argc; i++) {
			cout << argv[i] << endl;
		}
	}

	cout << "factorial of " << argv[1] << " is " << factorialr (atoi(argv[1])) << endl;
	cout << "factorial of " << argv[2] << " is " << factoriali (atoi(argv[2])) << endl;
    cout << "your grade must have been " << scores(argv[3][0]) << " to get a " << argv[3] << endl;

	cout << "Enter miles & gallons ";
	cin >> m >> g;
    cout << "MPG is " << mpg(m, g) << endl;
	return 0;
}