_beginthread multithreading magic

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <process.h>
#include <iostream>

void ThreadFunc(void* data) {
  // Do stuff.  This will be the first function called on the new thread.
  // When this function returns, the thread goes away.  See MSDN for more details.
  int j = 0;
  while (j < 1000) {
    printf("(%d) ", j);
    j++;
  }
}

int main() {
    int i = 0;
    while (i < 5) {
        printf("C");
        i++;
    }
  HANDLE thread = (HANDLE)_beginthread(&ThreadFunc, 0, 0);
  if (thread) {
    // Optionally do stuff, such as wait on the thread.
  }
  i = 0;
  while (i < 100) {
    printf("%d ", i);
    i++;
  }
}