#include <iostream.h>
#include <math.h>
#include "CPstring.h"

// file: getgrade.cc
// demo a function that returns a string value
// demo cascaded else/if style
// functions that return values

string Grade(double score)
{
   if (score > 90.0)
   {
      return "A" ;
   }
   else if (score > 80.0)
   {
      return "B" ;
   }
   else if (score > 70.0)
   {
      return "C" ;
   }
   else if (score > 60.0)
   {
      return "D" ;
   }
   else
   {
      return "F" ;
   }
}

string Curve(double score)
{
   score = 10.0 * sqrt(score);
   return Grade(score);
}

int main()
{
   double grade;

   cout << "Enter your numberic grade: ";
   cin >> grade;

   cout << "Your raw grade is: " << Grade(grade) << endl;
   cout << "Your curved grade is: " << Curve(grade) << endl;

   return 0;
}

Sample output:
< getgrade
><Enter your numberic grade: 83
> Your raw grade is: B
> Your curved grade is: A

< getgrade
><Enter your numberic grade: 64
> Your raw grade is: D
> Your curved grade is: C

< getgrade
><Enter your numberic grade: 95
> Your raw grade is: A
> Your curved grade is: A

< getgrade
><Enter your numberic grade: 90
> Your raw grade is: B
> Your curved grade is: A