#include

#include

#define MAX 12

#define TBLSZE 0x100

#define uchar unsigned char

#define ulong unsigned long

static uchar rev_tbl[TBLSZE];

static uchar rev(uchar u) {

uchar ur = 0, u2 = u, bit;

for (bit = 0; bit < 8; (u2 & 1)?

      (ur |= 1 << (7 - bit)):0,

      bit++, u2 >>= 1);

return (ur);

}

int main(void) {

uchar in[MAX], i;

ulong num, u, mun;

// Construct the static table

if (rev_tbl[0] == '\0') {

      for (u = 0; u < TBLSZE;

            rev_tbl[u] = rev((uchar)u), u++);

}

// Prompt for user entry

printf("Enter a number in hexadecimal(0x~ or 0X~), "

      "octal(0~), or decimal: ");

// Process user input

if (fgets(in, MAX, stdin)) {

      num = strtoul(in, NULL, 0);

      // This one statement completes the reversal

      for (i = 0, mun = 0, u = num; i < 4;

            (mun |= rev_tbl[(uchar)(u & 0xff)] <<

            ((3 - i) * 8)), i++, u >>= 8);

      // Display the header banner

      printf("                   hex        dec        oct          bin\n");

      // Show the original number

      printf("reversal of number 0x%08x %-10u 0%-011o ",

            num, num, num);

      for (i = 0; i < 32; (num & (1 << (31 - i)))?

            printf("1"):printf("0"), i++);

      // Print the reversed number

      printf("\nis 0x%08x %-10u 0%-011o ",

            mun, mun, mun);

      for (i = 0; i < 32;

            (mun & (1 << (31 - i)))?

            printf("1"):printf("0"), i++);

      }

}