time as the value of a variable in C

wincrk · 04-08-2003, 09:33 AM

hi, i am a beginner in programming with C. for this moment, i am using borland turbo C++ 3.0 as my compiler. i wonder about certain thing:

1. how to set a variable to hold value of current time ? for example, i want to set variable 'the_time' to hold the current time of a particular machine and it will keep that value even the time on that machine is running.

2. usually, we define a value for a variable or the user will be asked to key in the value. the value that defined by programmer will remain unchanged when we close it and rerun the program, while the value that inserted by user will be lost when the program is close.
my question is how how to make the value that had been inserted by user will remained for a variable so the user could used the the same value again when he reopen the program?

if there any solution, please let me know, and what is the header file should included for both of my question.

please help me.

Palin · 04-08-2003, 10:52 AM

For time functions look for references on time.h

as for remembering the value of something you need to send it to permanant storage before you close the program ( ie write it to a file )
you would want either iostream.h for those types of functions. This is a small tutorial on file io
http://www.codenewbie.com/forum/show...=&threadid=755

wincrk · 04-09-2003, 08:54 PM

thanks, but actually.... it is hard for me to understand the tutorial. i think i need an example along the tutorial. a really clear example

Tinkster · 04-09-2003, 10:16 PM

Code:

#include <iostream>
#include <fstream>
#include <ctime>
#include <string>

void main (void)
{
  time_t myTime;
  time(&myTime); // get current time
  string sMyTime = ctime( &myTime ); //convert time to "human readable"
  const char cFileName[]="saveTime";
  ofstream File;
  File.open( cFileName , ios::out );
  File.write( sMyTime.c_str(), sMyTime.size() );
}

This is C++, poorly (&quickly) whipped together,
no error handling of any kind, but you might get
the idea :}

Cheers,
Tink

P.S.: A nice, Unix specific introduction to
C can be found here

wincrk · 04-09-2003, 11:57 PM

thanks Tinkster, this is better for me .

Tinkster · 04-10-2003, 02:34 PM

Pleasure mate, glad I could help :}

Cheers,
Tink