clock_t
| Defined in header <time.h>
|
||
| typedef /* unspecified */ clock_t; |
||
Arithmetic (until C11)Real (since C11) type capable of representing the processor time used by a process. It has implementation-defined range and precision.
Example
Run this code
#include <stdio.h> #include <time.h> volatile unsigned sink; int main (void) { clock_t start = clock(); for(size_t i=0; i<10000000; ++i) sink++; clock_t end = clock(); double cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC; printf("for loop took %f seconds to execute \n", cpu_time_used); }
Possible output:
for loop took 0.033492 seconds to execute
References
- C11 standard (ISO/IEC 9899:2011):
- 7.27.1/3 Components of time (p: 388)
- C99 standard (ISO/IEC 9899:1999):
- 7.23.1/3 Components of time (p: 338)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.12.1 Components of time
See also
| returns raw processor clock time since the program is started (function) | |
| number of processor clock ticks per second (macro constant) |