/* * File: hours.c * ------------- * This program converts 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 */static void ConvertTimeToHM(int time, int *pHours, int *pMinutes);/* Test program */main(){    int time, hours, minutes;    printf("Test program to convert time values\n");    printf("Enter a time duration in minutes: ");    time = GetInteger();    ConvertTimeToHM(time, &hours, &minutes);    printf("HH:MM format: %d:%02d\n", hours, minutes);}/* * Function: ConvertTimeToHM * Usage: ConvertTimeToHM(time, &hours, &minutes); * ----------------------------------------------- * This function converts a time value given in minutes into * an integral 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. */static void ConvertTimeToHM(int time, int *pHours, int *pMinutes){    *pHours = time / MinutesPerHour;    *pMinutes = time % MinutesPerHour;}