C Program Compute Powers of Two and Print With Different Integer Types

#include <stdio.h>
int main()
{
       int i=0;
       unsigned x=1;
       int intx=1;      /* added to original code so both can be seen at the same time*/
       clrscr();
         while (i <20)
           {
                printf("%8d:%8u:%8d\n",i,x,intx);
                /* %u is unsigned decimal format can only print as far as 2^14*/
                ++i;
                x *= 2;
                intx *= 2;
          }
               x= -1;
               printf("\n\nminus one = %8d%8u\n\n", x, x);
               /* x printed out as integer is -1 but as unsigned format prints 65535 */
               getch();
               return 0;
}