#include<iostream.h>

void main()
{
char pts;
double gpa;

cin.get();
int loop=5;
int total;

while(loop=!1)
{
cout<<"enter  your leter grade";
cin>>pts;
		if (pts='a','b','c','d','e','f','A','B','C','D','F')
		{
			  switch(pts)
			  {
				case 'a': gpa+=4; break;
				case 'b': gpa+=3; break;
				case 'c': gpa+=2; break;
				case 'd': gpa+=1; break;
				case 'f': gpa+=0; break;
				case 'A': gpa+=4; break;
				case 'B': gpa+=3; break;
				case 'C': gpa+=2; break;
				case 'D': gpa+=1; break;
				case 'F': gpa+=0; break;
				}
				total++; cout<<total;
		}

		else {loop=1;}
}
/*
gpa/=total;
cout<<gpa;*/
}