c pause for 1 second

1#include <stdio.h>
2#include <unistd.h> //you need this for linux!
3#include <dos.h> //you need this for Windows!
4
5int main(){
6    printf("Hello,");
7    sleep(5); // format is sleep(x); where x is # of seconds.
8    printf("World");
9    return 0;
10}