clock_t
From cppreference.com
C
Concurrency support (C11)
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
C++ documentation for clock_t