[ C++ ] Time Clock

1.Time

    time_t t1, t2; // typedef time_t long;
    t1 = time(NULL);
    Sleep(1234);
    t2 = time(NULL);
    printf("%ld secs\n", t2-t1);

result:1 sec

2.clock

    clock_t t1, t2;
    t1 = clock();
    Sleep(1234);
    t2 = clock();
    printf("%lf\n", (t2-t1)/(double)(CLOCKS_PER_SEC));


result : 1.234000sec