clock - report elapsed processor time
#include "zkTime.h"
clock_t clock(void);
The clock() function returns the implementation's best approximation to the processor time used by the process since the beginning of an implementation-dependent time related to the process invocation.
To determine the time in seconds, the value returned by clock() should be divided by the value of the macro CLOCKS_PER_SEC. If the processor time used is not available or its value cannot be represented, the function returns the value (clock_t)-1.
No errors are defined.
In order to measure the time spent in a program, clock() should be called at the start of the program and its return value subtracted from the value returned by subsequent calls.
The value returned by clock() may wrap around on some systems.