Date and time

genesaika · #1 05-Feb-2009, 11:01

I am working on a program for a restaurant menu where the user can buy meals, drinks, and so forth. I have the basic code in place and want to add in a specials menu that changes daily. At this time I am using __DATE__ and __TIME__ to get the date and time.

My issue is that I would like the time to change as if it was a clock. So how would I manage this ?

Regards,
Gene Saika

L7Sqr · #2 05-Feb-2009, 12:32

Have a look at ctime

genesaika · #3 05-Feb-2009, 23:21

Just to be certain... calling ctime(t) would make it so that if the user were to go to a different part of the program and come back to where the clock is the time would be the time at that moment?

Also would the time be constantly refreshing or at least refreshable?

L7Sqr · #4 06-Feb-2009, 06:13

Yes. Look at the following example:

CPP / C++ / C Code:

#include <stdio.h>
#include <time.h>
#include <unistd.h>

char * show_date () {
        time_t t = time (NULL);
        return ctime (&t);
}

int main(void) {
        printf ("Date at start   : %s", show_date());
        sleep (10);
        printf ("Date after sleep: %s", show_date());
        return 0;
}

And the output:

Quote:

Originally Posted by output

Date at start : Fri Feb 6 07:11:03 2009
Date after sleep: Fri Feb 6 07:11:13 2009

Each time you call the function you get the most current time. If you need something finer than second granularity you can look at gettimeofday.

genesaika · #5 06-Feb-2009, 09:53

Thank you that should work perfectly.

Would you mind explaining to me the use of unistd.h I have never heard of that header file.

L7Sqr · #6 06-Feb-2009, 12:26

My system man pages (it is a Linux system) say that the required header for sleep is unistd.h
Some systems may work without it, but I have it there for completeness.

genesaika · #7 06-Feb-2009, 17:19

ok thank you again

genesaika · #8 10-Feb-2009, 10:27

After implamenting the code into my program i found that it does work.

Now I need this to refresh constantly and still display other things after that and get input from them.

This is how I have the code so far ( not the full code but an example)

CPP / C++ / C Code:

#include <iostream.h>
#include <stdio.h>
#include <time.h>

char * show_date () {
        time_t t = time (NULL);
        return ctime (&t);
}

int main()
{

int ct = 0 ;
int option = 0 ;

cout << " options 1 - 5" ;

while (ct == 0 ){
cout << show_time () ;
Sleep (1000) ;
}

cout << " Which option do you want?" ;
cin >> option ;

return 0 ;

I figure I could get the program to clear the line in the while loop and that would fix the repeating of the info, but I don't know how to do that.

Also I need the code to still ask the user which option they want and get the input.

I am using windows OS.

Regards,
Gene Saika

L7Sqr · #9 10-Feb-2009, 11:15

I'm not sure what you are trying to do here.
Are you looking to have the user input some value and then display the time that input was read? Or are you looking to continually output the time until a user makes a selection? If you put a display/sleep execution within a while loop and do not change the conditional to that loop (ct == 0 in your example) that is what is called an infinite loop.
You may have other intentions. Please clarify

genesaika · #10 10-Feb-2009, 17:38

I am wanting the time to be like a clock that ran in the of my program while everything else still continues to move on.

So yes I want the time to be in an infinite loop so that is constantly refreshing, but I want the rest of the program to keep going.

So when run the program should have a digital clock running with the current time while still letting the user input and move about the program.

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