clock_t
From cppreference.com
C
Date and time utilities
| Functions | ||||
| Time manipulation | ||||
(C11) | ||||
(C23) | ||||
| Format conversions | ||||
(deprecated in C23)(C11) | ||||
(deprecated in C23)(C11) | ||||
(C95) | ||||
(C23)(C11) | ||||
(C23)(C11) | ||||
| Constants | ||||
| Types | ||||
clock_t | ||||
(C11) |
| 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.
[edit] Example
Run this code
#include <stdio.h> #include <time.h> #include <math.h> volatile double sink; int main (void) { clock_t start = clock(); for(size_t i=0; i<3141592; ++i) sink+=sin(i); 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 0.271828 seconds to execute
[edit] References
- C17 standard (ISO/IEC 9899:2018):
- 7.27.1/3 Components of time (p: 284)
- 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
[edit] See also
| returns raw processor clock time since the program is started (function) [edit] | |
| number of processor clock ticks per second (macro constant) [edit] | |
| C++ documentation for clock_t
| |
