Lab 4 - re

//Rebecca Wong, pikachu1997@gmail.com
//Lab 4
//November 2, 2015

#include <iostream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <cctype>
#include <cmath>
#define PROFIT 0.80
using namespace std;

//Function prototypes (declaration)
int calcCopies(int, int);
double calcProfit(int, double, int, char, char);
void output(string, int, double);

void signature()
{
	string email = "pikachu1997@gmail.com",
		lab = "Lab 4",
		student = "Rebecca Wong";

	cout << endl << student << endl;
	cout << lab << endl;
	cout << email << endl;
}

int main()
{
	//Declare variables
	string ISBN;
	double unitPrice, profit;
	int expectedClass, copies, finalCopies;
	char text, text2;
	char requiredText = 'R', suggestedText = 'S';
	char newText = 'N', previousText = 'O';

	//Prompt user for input
	cout << "Enter the book's ten digit ISBN number: ";
	cin >> ISBN;

	cout << "Enter the price per book copy: ";
	cin >> unitPrice;

	cout << "Enter the expected class enrollment: ";
	cin >> expectedClass;

	cout << endl << "Is the text required or suggested? "
		<< endl << "Enter ""R"" for required text, or ""S"" for suggested text: ";
	cin >> text;
	text = toupper(text);

	cout << endl << "Is the text new or has it been used in previous quarters? "
		<< endl << "Enter ""N"" for new text, or ""O"" for a previously used text: ";
	cin >> text2;
	text2 = toupper(text2);

	//Calls function that calculates the number of copies needed
	finalCopies = calcCopies(copies, expectedClass);

	//Calls function that calculates the profit
	profit = calcProfit(copies, unitPrice, expectedClass, text, text2);

	//Calls function for output
	output(ISBN, finalCopies, profit);

	signature();
	system("pause;");
	return 0;
}
int calcCopies(int copies, int enrollment)
{
	/*
	Pre: copies - number of books to order
		 enrollment - number of students that are going to buy a book
	Purpose : compute the number of copies needed
	Post : return finalCopies value
	*/

	int finalCopies = copies * enrollment;

	return finalCopies;
}

double calcProfit(int copies, double unitPrice, int classEnrollment, char text, char text2)
{
	/*
	Pre : copies - number of copies
		  unitPrice - price of a book for the student
		  classEnrollment - expected number of students for that class
		  text - required or suggested book
		  text 2 - new or old book
	Purpose : calculate the profit the bookstore earns
	Post : return porfit value
	*/
	double pricePerBook = .20 * unitPrice;
	double profit;

	if (text == 'R' && text2 == 'N')
	{
		profit = copies * pricePerBook * classEnrollment * 0.90;
	}

	else if (text == 'R' && text2 == 'N')
	{
		profit = copies * pricePerBook * classEnrollment * 0.65;
	}

	else if (text == 'S' && text2 == 'N')
	{
		profit = copies * pricePerBook * classEnrollment * 0.40;
	}

	else if (text == 'S' && text2 == 'O')
	{
		profit = copies * pricePerBook * classEnrollment * 0.20;
	}

	return profit;
}

void output(string ISBN, int finalCopies, double profit)
{
	/*
	Pre : ISBN - ISBN number of the book
		  finalCopies - number of books to be bought
		  profit - profit the bookstore gains
	Purpose : print results our for bookstore's use
	Post : output
	*/
	cout << setprecision(2) << fixed;

	cout << "ISBN" << ISBN << endl;
	cout << "Copies needed: " << finalCopies << endl;
	cout << "Profit: " << "$" << profit << endl;

	return;
}
/*
CALCULATE
Calculate the number of copies needed and the profit if the store pays 80% of list (use
global define for this). For the number of books to order, round up to the nearest whole
book.

OUTPUT A sample run might look like this:
Enter book number: 0755798652
Enter price per copy: 34.98
Enter expected class enrollment: 35
Enter 'R' if required or 'S' if suggested: r
Enter 'N' if new or 'O' if not a new text: O
ISBN: 0755798652
Copies Needed: 23
Profit: $ 160.91

TEST DATA
0755798652,34.98,35,R,O
3453456784,23.95,100,R,N
5677655673,54.50,40,R,O
2462462464,5.95,40,S,O
8953647888, 65.99, 35, N, Y

THEME ISSUES
Functions (pass by value), IF Control Structures, character type, rounding

Checkpoints
2) Minimum of three (3) comments in each function (Purpose: Pre: Post:)
4) To do this use if() and assign uppercase value or you may use
toupper() function (see 10.2 on page 545 of text). Only an error message should
be output and nothing more if data is erroneous. Use exit() function as explained
in 6.15 (p. 360).
5) A function must be used to calculate the number of books to be ordered. Round to the nearest whole number.
Hint: static_cast<int> (x + .5)
8) Output must be formatted using dollar sign and 2 decimal place as shown on page 1.

Test Data: Execute the program five times and each time copy and paste the
output to the bottom of the program.
Set 1 –0755798652, 34.98, 31, R, O
Set 2 – 3453456784, 23.95, 100, r, N
Set 3 – 5677655673, 54.50, 40, R, O
Set 4 – 2462462464, 5.95, 40,s,O
Set 5 – 8953647888, 65.99, 35, N, Y
*/