The clever integer to ASCII hexadecimal conversion !

itohex.c

#include <stdio.h>

char *itohex(int n) {
   int i = 2*sizeof (int);
   char *str = malloc(i + 1);

   str[i] = '\0';
   for ( ; i > 0; n >>= 4)
      str[--i] = "0123456789ABCDEF"[n&0xF];
   return str;
}


int main()
{
    char * data = itohex(256);
    printf(data);
    free(data);
    return 0;
}