Programming in C

178 Chapter 9 Working with Structures

1. If the number of seconds reaches 60, the seconds must be reset to 0 and the min-
   utes increased by 1.


2. If the number of minutes reaches 60, the minutes must be reset to 0 and the hour
   increased by 1.


3. If the number of hours reaches 24, the hours, minutes, and seconds must be reset
   to 0.
   Program 9.5 uses a function called timeUpdate, which takes as its argument the current
   time and returns a time that is one second later.

Program 9.5 Updating the Time by One Second

// Program to update the time by one second

#include <stdio.h>

struct time

{

int hour;

int minutes;

int seconds;

};

int main (void)

{

struct time timeUpdate (struct time now);

struct time currentTime, nextTime;

printf ("Enter the time (hh:mm:ss): ");

scanf ("%i:%i:%i", ¤tTime.hour,

¤tTime.minutes, ¤tTime.seconds);

nextTime = timeUpdate (currentTime);

printf ("Updated time is %.2i:%.2i:%.2i\n", nextTime.hour,

nextTime.minutes, nextTime.seconds );

return 0;

}

// Function to update the time by one second

struct time timeUpdate (struct time now)

{

++now.seconds;