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This program displays the local time defined by the system:
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#include <stdioh> #include <timeh> int main(void) { struct tm *ptr; time_t lt; lt = time(NULL); ptr = localtime(<); printf(asctime(ptr));
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return 0; }
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localtime( ), gmtime( ), time( ), ctime( )
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clock_t clock(void)
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The prototype for clock( ) is in <timeh> The clock( ) function returns the amount of time elapsed since the program that called clock( ) started running If a clock is not available, 1 is returned To convert the return value to seconds, divide it by the macro CLK_TCK
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Example
This program times the number of seconds that it takes for the empty for loop to go from 0 to 500000:
#include <stdioh> #include <timeh> int main(void) { clock_t start, stop; unsigned long t; start = clock(); for(t=0; t<500000L; t++); stop = clock(); printf("Loop required %f seconds", (stop - start) / CLK_TCK); return 0; }
14:
Time, Date, and System-Related Functions
Related Functions
localtime( ), gmtime( ), time( ), asctime( )
char *ctime(const time_t *time)
Description
The prototype for ctime( ) is in <timeh> The ctime( ) function returns a pointer to a string of the form day month date hours:minutes:seconds year given a pointer to the calendar time The calendar time is generally obtained through a call to time( ) The ctime( ) function is equivalent to
asctime(localtime(time)) THE C++ BUILDER FUNCTION LIBRARY
The buffer used by ctime( ) to hold the formatted output string is a statically allocated character array and is overwritten each time the function is called If you wish to save the contents of the string, it is necessary to copy it elsewhere
Example
This program displays the local time defined by the system:
#include <stdioh> #include <timeh> #include <stddefh> int main(void) { time_t lt; lt = time(NULL); printf(ctime(<)); return 0; }
Borland C++ Builder: The Complete Reference
Related Functions
localtime( ), gmtime( ), time( ), asctime( )
double difftime(time_t time2, time_t time1)
Description
The prototype for difftime( ) is in <timeh> The difftime( ) function returns the difference, in seconds, between time1 and time2 That is, it returns time2 time1
Example
This program times the number of seconds that it takes for the empty for loop to go from 0 to 500,000:
#include <stdioh> #include <timeh> #include <stddefh> int main(void) { time_t start,end; long unsigned int t; start = time(NULL); for(t=0; t<500000L; t++) ; end = time(NULL); printf("Loop required %f seconds", difftime(end, start)); return 0; }
Related Functions
localtime( ), gmtime( ), time( ), asctime( )
14:
Time, Date, and System-Related Functions
void disable(void) void _disable(void)
Description
The prototypes for disable( ) and _disable( ) are in <dosh> These macros are not defined by the ANSI/ISO C/C++ standard The disable( ) and _disable( ) macros disable interrupts The only interrupt that they allow is the NMI (nonmaskable interrupt) Use this function with care because many devices in the system use interrupts
THE C++ BUILDER FUNCTION LIBRARY
Related Functions
enable( ), geninterrupt( )
unsigned _dos_close(int fd)
Description
The prototype for _dos_close( ) is in <dosh> This function is not defined by the ANSI/ISO C/C++ standard This function is obsolete and not recommended for future code The _dos_close( ) function closes the file specified by the file descriptor fd The file must have been opened using a call to either _dos_creat( ), _dos_open( ), or _dos_creatnew( ) The function returns 0 if successful Otherwise, non-0 is returned and errno is set to EBADF (bad file descriptor)
Example
This fragment closes the file associated with the file descriptor fd:
_dos_close(fd);
Related Functions
_dos_creat( ), _dos_open( )
Borland C++ Builder: The Complete Reference
unsigned _dos_creat(const char *fname, unsigned attr, int *fd) unsigned _dos_creatnew(const char *fname, unsigned attr, int *fd)
Description
The prototypes for _dos_creat( ) and _dos_creatnew( ) are in <dosh> These functions are not defined by the ANSI/ISO C/C++ standard These functions are obsolete and not recommended for future code The _dos_creat( ) function creates a file by the name pointed to by fname with the attributes specified by attr It returns a file descriptor to the file in the integer pointed to by fd If the file already exists, it will be erased The _dos_creatnew( ) function is the same as _dos_creat( ) except that if the file already exists, it will not be erased and _dos_creatnew( ) will return an error The valid values for attr are shown here (The macros are defined in <dosh>)
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