/*
 * File: hours.c
 * ------------------------------------
 * Test program to convert a time given in minutes into 
 * separate values representing hours and minutes.  The
 * program is written as an illustration of C's mechanism
 * for simulating call by reference.
 */

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

/* Constants */
#define MinutesPerHour 60

/* Function Prototypes */

void ConvertToHoursAndMinutes (int, int *, int *) ;

/* Test Program */
main () {
   int time, hours, minutes ;

   printf("Test prgram to convert time values\n") ;
   printf("Enter a time duration in minutes: ") ;
   time = GetInteger() ;
   ConvertToHoursAndMinutes(time, &hours, &minutes) ;
   printf("HH:MM format: %d:%2d\n", hours, minutes) ;
}

/*
 * Function: ConvertToHoursAndMinutes
 * Usage: ConvertToHoursAndMinutes(time, &hours, &minutes) ;
 * ---------------------------------------------------------
 * Converts a time value given in minutes into the number
 * of hours and the remaining number of minutes.  Note that
 * the last two arguments must be passed using their addresses
 * so that the function can correctly set those values.
 */

void ConvertToHoursAndMinutes
   (int time, int *pHours, int *pMinutes) {

   *pHours = time / MinutesPerHour ;
   *pMinutes = time % MinutesPerHour ;
}