time delay in c 2b 2b

1//in Win32
2#include<windows.h>
3Sleep(milliseconds);
4
5//in Unix
6#include<unistd.h>
7unsigned int microsecond = 1000000;
8usleep(3 * microsecond); //sleeps for 3 seconds
9sleep(3);

1#include <unistd.h>
2 sleep(10);

1#include<windows.h>
2Sleep(milliseconds);
3