Clock (computing)

==CLOCK==
Clock is a library function which returns the number of clock pulses when the program starts.
 The expression CLOCKS_PER_SEC states the relation between a clock pulse and a second.

The syntax of this function is:
clock_t clock (void);

Return value of this function:

This function returns the number of clock pulses elapsed when the program starts, else on failure, 
it returns -1.