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C Library -The time.h header defines four variable types, two macro and various functions for manipulating date and time. Dos.h delay function in C: Here, we will learn about the delay function of dos.h header file in C through a simple example/program. A humble request Our website is made possible by displaying online advertisements to our visitors. May 21, 2016 ow to use random(25) function in dev c? Which header file will use here? Jul 03, 2019 C program should necessarily contain the header file which stands for input and output stream used to take input with the help of “ cin ” function and display the output using “ coutheader file of C and C has its own specific function associated with it. Include the following function at the start of your code, whenever you want to busy wait. This is distinct from sleep, because the process will be utilizing 100% cpu while this function is running.
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The time.h header defines four variable types, two macro and various functions for manipulating date and time.
Library Variables
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Following are the variable types defined in the header time.h −
Sr.No. | Variable & Description |
---|---|
1 | size_t This is the unsigned integral type and is the result of the sizeof keyword. |
2 | clock_t This is a type suitable for storing the processor time. |
3 | time_t is This is a type suitable for storing the calendar time. |
4 | struct tm This is a structure used to hold the time and date. |
The tm structure has the following definition −
Library Macros
Following are the macros defined in the header time.h −
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Sr.No. | Macro & Description |
---|---|
1 | NULL This macro is the value of a null pointer constant. |
2 | CLOCKS_PER_SEC This macro represents the number of processor clocks per second. |
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Library Functions
Following are the functions defined in the header time.h −
Sr.No. | Function & Description |
---|---|
1 | char *asctime(const struct tm *timeptr) Returns a pointer to a string which represents the day and time of the structure timeptr. |
2 | clock_t clock(void) Returns the processor clock time used since the beginning of an implementation defined era (normally the beginning of the program). |
3 | char *ctime(const time_t *timer) Returns a string representing the localtime based on the argument timer. |
4 | double difftime(time_t time1, time_t time2) Returns the difference of seconds between time1 and time2 (time1-time2). |
5 | struct tm *gmtime(const time_t *timer) The value of timer is broken up into the structure tm and expressed in Coordinated Universal Time (UTC) also known as Greenwich Mean Time (GMT). |
6 | struct tm *localtime(const time_t *timer) The value of timer is broken up into the structure tm and expressed in the local time zone. |
7 | time_t mktime(struct tm *timeptr) Converts the structure pointed to by timeptr into a time_t value according to the local time zone. |
8 | size_t strftime(char *str, size_t maxsize, const char *format, const struct tm *timeptr) Formats the time represented in the structure timeptr according to the formatting rules defined in format and stored into str. |
9 | time_t time(time_t *timer) Calculates the current calender time and encodes it into time_t format. |