/*
 * Project1.c
 * Chapter 8
 * By John Stile
 * Purpose:  Write a short program that calls several functions from main.
 *           Prototype the functions.
 *           Define the funcitons after main.
 *           Include 1 funciton for each of the following:
 *   1. Function does nto accept arguments but returns an int
 *   2. Fucntion accepts an int and float, returns a float   
 *   3. Fucntion accepts char arguments and returns int.
 *   4. Fucntion accepts two char arguments and returns nothing.
 */
#include <stdio.h>
#define PI 3.141592
////////////////////////////////////////////////////
int func1(void);           // Proto: takes nothing, returns int
float func2(int, float); // Proto: takes int and float, returns float 
int func3(char);         // Proto: takes char, returns int
void func4(char,char);   // Proto: takes 2 char, returns nothing
////////////////////////////////////////////////////
int main(void)
{
  // declare variables needed to pass to functions
  char  aa, bb; // declare 2 chars
  int   cc;     // declare 1 int
  float dd;    // declare 1 float

  cc=func1(); // Prompt user to input an int
  printf("You entered %d\n", cc);  // show them what was input

  dd=func2( cc, PI); // Find Area, assign to float dd
  printf("If %d was a radius, the Area would be %f\n", cc,dd);

  printf ("Enter a character: "); // prompt for inmput
  scanf("%c", &aa);  // read standard in, assign to location of cc  
  getchar(); // clear buffer  
  printf ("Enter another character: "); // prompt for inmput
  scanf("%c", &bb);  // read standard in, assign to location of cc

  cc=func3(aa);   // Call function,   
  printf(" Your letters ascii value :\t%4d\n",cc);
   
  cc=func3(aa);   // Call function,   
  printf(" Your other letters ascii value:\t%4d\n",cc);

  func4(aa,bb);    

  return 0;
}
////////////////////////////////////////////////////
int func1(void) // header for inputing a radios
{
   int xx;
   printf("Please enter a integer: "); // prompt for an int
   scanf("%d", &xx );  // read standard input, assign to address of xx
   getchar(); // flush the input buffer
   return (xx);
}
////////////////////////////////////////////////////
float func2(int xx, float yy) // header for area = PI r^2
{
  return ( yy*xx*xx );
}
////////////////////////////////////////////////////
int func3(char xx)
{
  return( (int)xx );
}
////////////////////////////////////////////////////
void func4( char aa, char bb)
{
  printf( " You like the letters %c and %c\n", aa, bb);
}