#include <stdio.h>
  #include <stdlib.h>
  
  int main ()
  {
    int i;
    char buffer [33];
    printf ("Enter a number: ");
    scanf ("%d",&i);
    itoa (i,buffer,10);
    printf ("decimal: %s
  ",buffer);
    itoa (i,buffer,16);
    printf ("hexadecimal: %s
  ",buffer);
    itoa (i,buffer,2);
    printf ("binary: %s
  ",buffer);
    return 0;
  }