[Dev-C++] \a does not beep

[rapee <ra...@ca...>]

Hi, 
 
\a in my program doesn't beep.  Here is my program. Please help.
#include <iostream>
#include <stdlib.h>
 
int main()
{
  int num;
    
  printf("enter 2 will beep");
  scanf("%d", &num);
  
  printf("beeping the computer\a\a\a\n");
                   
  system("PAUSE");       
  return 0;
}
 
Thanks in advance.