Learn C, C++ Programming

#include<stdio.h>
#include<dos.h>
#include<conio.h>
int main()
{
   struct date dt;

   printf("Enter new date in the format(day month year)");
   scanf("%d%d%d",&dt.da_day,&dt.da_mon,&dt.da_year);

   setdate(&dt);

   printf("Now, current system date is %d-%d-%dn"
   ,dt.da_day,dt.da_mon,dt.da_year);

   return 0;
}

Output:

Enter new date in the format(day month year) 01 12 2012 Now, current system date is 01-12-2012

Example program for getdate() function in C:

This function is used to get the CPU time.

#include<stdio.h>
#include<dos.h>
int main()
{
   struct date dt;

   getdate(&dt);

   printf("Operating system's current date is %d-%d-%dn"
   ,dt.da_day,dt.da_mon,dt.da_year);

   return 0;
}

Output:

Operating system’s current date is 12-01-2012

 Example program for clock() function in C:

This function is used to get current system time

#include <stdio.h>
#include <time.h>
#include <math.h>
int main()
{
    int i;
    clock_t CPU_time_1 = clock();
    printf("CPU start time is : %d n", CPU_time_1);
    for(i = 0; i < 150000000; i++);
    clock_t CPU_time_2 = clock();
    printf("CPU end time is : %d", CPU_time_2);
}

 Output:

CPU start time is : 0 CPU end time is  : 380000

Example program for time() function in C:

This function is used to get current system time as structure

#include <stdio.h>
#include <time.h>
int main ()
{
    time_t seconds;
    seconds = time (NULL);

    printf ("Number of hours since 1970 Jan 1st " 
            "is %ld n", seconds/3600);
    return 0;
}

Output:

Number of hours since 1970 Jan 1st is 374528

Example program for difftime() function in C:

This function is used to get the difference between two given times

#include <stdio.h>
#include <time.h>
 int main()
 {
    time_t begin,end;
    long i;
    begin= time(NULL);
    for(i = 0; i < 150000000; i++);
    end = time(NULL);
    printf("for loop used %f seconds to complete the " 
           "executionn", difftime(end, begin));
    return 0;
}

Output:

for loop used 15.000000 seconds to complete the execution

Example program for strftime(), asctime() and localtime() in C:

• strftime()    – This function is used to modify the actual time format.
• asctime()   – tm structure contents are interpreted by asctime() function as calendar time. This time is converted into string.
• localtime() – This function shares the tm structure that contains date and time informations.

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

#define LEN 150
int main ()
{
   char buf[LEN];
   time_t curtime;
   struct tm *loc_time;

   //Getting current time of system
   curtime = time (NULL);

   // Converting current time to local time
   loc_time = localtime (&curtime);

   // Displaying date and time in standard format
   printf("%s", asctime (loc_time));

   strftime (buf, LEN, "Today is %A, %b %d.n", loc_time);
   fputs (buf, stdout);
   strftime (buf, LEN, "Time is %I:%M %p.n", loc_time);
   fputs (buf, stdout);

   return 0;
}

Output:

Sat Sep 22 01:15:03 2012 Today is Saturday, Sep 22. Time is 01:15 AM.

Example program for mktime() and ctime() functions in C:

• mktime() function interprets tm structure as calendar time.
• ctime() function is used to return string that contains date and time informations.

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

int main()
{
    struct tm strtime;
    time_t timeoftheday;

    strtime.tm_year = 2008-1900;
    strtime.tm_mon = 1;
    strtime.tm_mday = 4;
    strtime.tm_hour = 02;
    strtime.tm_min = 30;
    strtime.tm_sec = 38;
    strtime.tm_isdst = 0;

    timeoftheday = mktime(&strtime);
    printf(ctime(&timeoftheday));

    return 0;
        }

Output:

Mon Feb 4 02:30:38 2008

Example program for gmtime() function in C:

This function shares the tm structure that contains date and time informations.

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

int main()

{

    time_t orig_format;
    time(&orig_format);

    printf ("Universal Time is %s",
    asctime(gmtime(&orig_format)));

    return 0;

}

Universal Time is Sat Sep 22 08:11:40 2012