clock - CPU time used since the program call

Definition	#include <time.h> clock_t clock(void); clock supplies the CPU time which has elapsed since the program was called.
Return val.	The CPU time in ten thousandths of a second since the program was called if successful. (clock_t) -1 if the time cannot be calculated or represented.
Notes	clock is implemented as a macro and as a function (see section “Functions and macros”). To obtain the time in seconds, the result of clock must be divided by the value of the CLOCKS_PER_SEC macro.
Example	#include <time.h> #include <stdio.h> int main(void) {   clock_t result;   result = clock();   printf("used cputime %f seconds\n", ((float)result / CLOCKS_PER_SEC));   return 0; }
See also	cputime