2.15.3 clock
Declaration:
clock_t clock(void);
Returns the processor clock time used since the beginning of an implementation-defined era (normally the beginning of the program). The returned value divided by CLOCKS_PER_SEC
results in the number of seconds. If the value is unavailable, then -1 is returned.
Example:
#include<time.h> #include<stdio.h> int main(void) { clock_t ticks1, ticks2; ticks1=clock(); ticks2=ticks1; while((ticks2/CLOCKS_PER_SEC-ticks1/CLOCKS_PER_SEC)<1) ticks2=clock(); printf("Took %ld ticks to wait one second.\n",ticks2-ticks1); printf("This value should be the same as CLOCKS_PER_SEC which is %ld.\n",CLOCKS_PER_SEC); return 0; }