// Bob Myers
//
// Function prototypes at the top
// See if you can guess which calls in main() the compiler will allow
//  and which ones cause syntax errors.  (Then compile to check).
//  (Only the prototypes are needed to figure this out).

#include <stdio.h>  

double Average(double x, double y);
char GetACharacter();
void PrintValues(int count, double amount);

int main()
{
   char c1, c2;
   double d1, d2, d3;
   int i1, i2;

   // are these calls LEGAL or ILLEGAL, syntactically?
   //   (put yourself in the compiler's shoes)

   Average(d1, d2);		
   c1 = Average(d1, d2);
   d1 = Average(d2, d3);
   d3 = Average(d2, i2);

   c1 = GetACharacter;    
   c2 = GetACharacter();   
   i1 = GetACharacter();  	

   PrintValues(int,double); 
   i2 = PrintValues(i1, d1);	
   PrintValues(i2, d2);
   PrintValues(d1, i2);
}

double Average(double x, double y)
{
   return (x + y) / 2.0;
}

char GetACharacter()
{
   char ch;
   scanf(" %c", &ch);
   return ch;
}

void PrintValues(int count, double amount)
{
   printf("Here are the two values:\n");
   printf("------------------------------------------\n");
   printf("\t%d\t%f\n", count, amount);
}