/*
 * funcint3A.c
 */
#include <stdio.h>

int getanswer(void);  // prototype: takes nothing, returns int
float intaverage(int, int); // prototype: takes 3 int's, returns a float
int intproduct(int,int); // prototype: takes 2 ints, returns 1 int

int main(void) // header for function main: takes nothing, returns int
{
  int aa, bb; // declare 2 ints

  float avrg;  // declare float

  int prod; // declare 1 int

  do // execute block, then evalueat while befor second pass
  {
    puts("This program calculates the average, product of two integers.\n");

    printf("Enter two integers separated by a space: ");

    scanf("%d%d", &aa, &bb); // read in 2 integers, 
                           // interpret as digits
                           // assign to memory location of aa and bb
    getchar(); // fluch input buffer

    avrg=intaverage(aa,bb); // call function intaverage with value at aa and bb
                            // assign result to avrg
 
    printf("\n\nThe average of %d and %d is %.2f.\n", aa, bb, avrg);

    prod=intproduct(aa,bb); // call function intproduct with value at aa and bb
                          // assign result to prod
                          
    printf("The product of %d and %d is %d.\n", aa, bb, prod);
  } 
  while( getanswer() ); // call function getanswer, 
                        // if return value is 1, return to block

  return 0;
}

int getanswer(void) // header for function getanswer, takes nothing, returns int
{
  char cc; // declare char 
  printf("\nPress 'q' to quit, any other key to continue: "); // prompt for user input
  cc=getchar(); // read from stdin, assing one char to cc
  if ( cc=='q') // if char is q, 
  {
    return 0; // reutrn 0 to calling fucntion
  }
  else
  {
    return 1; // return 1 to calling fruntion
  }
}

float intaverage(int xx, int yy) // header for function intaverage:
                                 // takes 2 ints, assigns to xx and yy
                                 // returns a float
{
  return (xx+yy)/2.0; // add xx and yy,
                      // divide result by 2.0
                      // Return the result to calling function 
}

int intproduct(int xx, int yy) // header for function intproduct:
                               // takes 2 ints, assigns to xx and yy
                               // returns an int
{
  return (xx*yy); // multiply xx by yy
                  // return result to calling funxiton
}