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Calculate the difference between two times
#include <time.h>
double difftime( time_t time1,
time_t time0 );
- time1, time0
- The times to compare, expressed as time_t objects.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The difftime() function calculates the difference
between the calendar times specified by time1 and
time0:
time1 - time0
The difference between the two times (in seconds).
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
void compute( void )
{
int i, j;
for( i = 1; i <= 20; i++ ) {
for( j = 1; j <= 20; j++ ) {
printf( "%3d ", i * j );
}
printf( "\n" );
}
}
int main( void )
{
time_t start_time, end_time;
start_time = time( NULL );
compute();
end_time = time( NULL );
printf( "Elapsed time: %f seconds\n",
difftime( end_time, start_time ) );
return EXIT_SUCCESS;
}
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
asctime(),
clock(),
ctime(),
gmtime(),
localtime(),
mktime(),
strftime(),
time(),
tzset()
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