#include <ctime>
    clock_t clock( void );

The clock() function returns the processor time since the program started, or - 1 if that information is unavailable. To convert the return value to seconds, divide it by CLOCKS_PER_SEC. (Note: if your compiler is POSIX compliant, then CLOCKS_PER_SEC is always defined as 1000000.)

Related Topics: asctime, ctime, time