include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
const double A = 4.0;
const double A_MINUS = 3.67;
const double B_PLUS = 3.33;
const double B = 3.0;
const double B_MINUS = 2.67;
const double C_PLUS = 2.33;
const double C = 2.0;
const double C_MINUS = 1.67;
const double D = 1.00;
const double F = 0.0;
string lettergrade;
double credit;
double caltimes = 0;
double totalcal = 0;
double totalcredit = 0;
double finalgpa = 0;
int option;
for(;;)
{
cout<<"\nEnter letter grade: ";
cin>>lettergrade;
cin.ignore();
cout<<"Enter the course credit: ";
cin>>credit;
if(lettergrade == "a" || lettergrade == "A")
{
caltimes = credit * A;
}
else if(lettergrade == "a-" || lettergrade == "A-")
{
caltimes = credit * A_MINUS;
}
else if(lettergrade == "b+" || lettergrade == "B+")
{
caltimes = credit * B_PLUS;
}
else if(lettergrade == "b" || lettergrade == "B")
{
caltimes = credit * B;
}
else if(lettergrade == "b-" || lettergrade == "B-")
{
caltimes = credit * B_MINUS;
}
else if(lettergrade == "c+" || lettergrade == "C+")
{
caltimes = credit * C_PLUS;
}
else if(lettergrade == "c" || lettergrade == "C")
{
caltimes = credit * C;
}
else if(lettergrade == "c-" || lettergrade == "C-")
{
caltimes = credit * C_MINUS;
}
else if(lettergrade == "d" || lettergrade == "D")
{
caltimes = credit * D;
}
else if(lettergrade == "f" || lettergrade == "F")
{
caltimes = credit * F;
}
else
{
cout<<"Invaild Input...";
}
totalcredit = totalcredit + credit;
totalcal = totalcal + caltimes;
cout<<"Do you want to enter another grade (1 - Yes, 2 - no): ";
cin>>option;
if(option == 1)
{
continue;
}
else
{
break;
}
}
finalgpa = totalcal/totalcredit;
cout<<"Student's GPA: "<<finalgpa<<"\n";
return 0;
}