//A program in C++ to calculate GPA
//version 1
//Barimani's Programming I class, Fall 2008
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int QP(string);

int main()
{
	int numberOfclasses, Credits, TotCredits=0;
	string Grade;
	double numerator=0, GPA;
	cout<<"# of classes? ";
	cin>>numberOfclasses;
	for (int i=1; i<=numberOfclasses; i++)
	{
		cout<<"Class # "<<i<<" Letter Grade (A, B, C, D, or F)? ";
		cin>>Grade;	
		cout<<"Class # "<<i<<" Credits? ";		
		cin>>Credits;
		TotCredits = TotCredits + Credits;
		numerator = numerator + Credits * QP(Grade);
		cout<<"----------\n";
	}
	GPA = numerator / TotCredits;
	cout<<"GPA= "<<GPA<<"\n";
	return 0;
}

int QP(string LG)
{
	int GradeWeight=0;
	if (LG == "A" || LG == "a")
		GradeWeight = 4.0;
	else
	if (LG == "B" || LG == "b")
		GradeWeight = 3.0;
	else
	if (LG == "C" || LG == "c")
		GradeWeight = 2.0;
	else
	if (LG == "D" || LG == "d")
		GradeWeight = 1.0;
	return GradeWeight;
}