/*
 * funcint2.c
 */
#include <stdio.h>

int getint(void); // function prototype: takes nothing, returns int

float intaverage(int, int, int); // prototype: takes 3 int's, returns a float

int main(void) // header for function main: takes nothing, returns int
{
  int aa, bb, cc; // declare 3 ints

  float avrg;  // declare float

  puts("This program calculates the average of three integers.\n");
  
  aa=getint(); // call funtion getint, assign to aa
  bb=getint(); // call funtion getin, assign to bb 
  cc=getint(); // call funtion getin, assign to cc 

  avrg=(float)(aa+bb+cc)/3; // add aa, bb, and cc,
                       // divide result by 3.0
                       // Assign to float avrg

  printf("The average of %d, %d, and %d is %f.\n",
          aa,bb,cc,avrg); // output result.

  return 0; // return 0 to calling program
}

float intaverage( int xx, int yy, int zz) // function header
{
  return (float)(xx+yy+zz)/3; // add xx to yy to zz
                              // cast resutl to a float
                              // divide by 3
                              // return result to calling function 
}

int getint(void) 
{
  int ii; // declare int 
  printf("Type an integer and press Enter: "); // prompt for input
  scanf("%d", &ii); // read from stdin
                    // interpret as a digit
                    // assign to memory location of ii
  return (ii); // return value of ii to calling function
}