//write include required statements
#include <string>

using std::string;
//Write a function prototype named get_grade_points that accepts a string letter_grade and returns
//an int.
int get_grade_points(string letter_grade);

double calculate_total_credit_points(int grade_points, int credit_hours);

//Write a function prototype with name calculate_gpa that accepts an int named credit_hours and
//an double named credit_points.  
double calculate_gpa(int credit_hours, double credit_points);
