/*
 * age2.c
 * By John Stile
 * Chapter2
 *   Ask use for the year they were born
 *     Capture the users entery and store it as an integer variable.
 *     Tell the user what year they entered
 */
#include <stdio.h>  // include functions in library stdio.h when compiling this code.

int birthyear(void)  // header for function birthyear, takes nothing, returns int
{
  int birthdate;  // declare variable birthdate
  printf(" What year where you born? (i.e 1969 )"); // Ask user for the year
  scanf( "%d", &birthdate); // Store input at memory address of int variable birthdate
  return birthdate;  // Return value of int variable birthday to caller
}

void age(int year)  // header for function age, takes an integer by the caller, and returns nothing.
{
  printf("You are %d years old\n", 2007-year);  // output the age of the user
}

int main(void)    // header for funciton main, 
{ 
  int birth;      // declare intiger variable birth 
  birth=birthyear();   // Assign return value from function birthyear to int variable birth
  printf("You entered %d\n", birth); // print the value stored in birth
 
  age(birth); // call function  age, sending it the int value stored in birth.

  return 0;  // return in value 0 to caller of main (exit statis of program)
}