// modified args.c
#include <stdio.h>
#include <stdlib.h> // for strtoul()
#include <errno.h>
//
void bprint( unsigned int x)
{
  for( int i = 31; i >= 0; --i) printf( "%i", (x >> i) & 1);
}

void convert( char s[])
{
  printf( "%s",s);
  errno = 0; char *e;
  unsigned long il;
  // s+2  same as  &s[2]
  if( s[0] == '0' && s[1] == 'b') il = strtoul( s+2, &e, 2); // base 2
  else il = strtoul( s, &e, 0); // handles octal, decimal, and hex
  if( errno != 0) { perror("strtoul"); }
  if( *e != 0) { fprintf( stderr, "bad input\n"); }

  unsigned int i = il; // if i != il then error...

  printf( " = %u = 0x%x = ", i, i); // %u format for unsigned int
  bprint(i); printf("\n");

 // reverse the bits in i and then print in decimal, hex, and binary
}

int main( int argc, char *argv[]) 
{
  for( int i = 1; i < argc; ++i) convert(argv[i]);
  return 0;
}

/* sample run:

$ ./args 12 011 0xff 0b101
12 = 12 = 0xc = 00000000000000000000000000001100
011 = 9 = 0x9 = 00000000000000000000000000001001
0xff = 255 = 0xff = 00000000000000000000000011111111
0b101 = 5 = 0x5 = 00000000000000000000000000000101
$

*/