ECE 3600 - Assignment P02 - Due: 3 Sept 2022

1. Takes command-line arguments representing unsigned integers in decimal, octal (0...), hex (0x...), or binary (0b...) formats.

2. Uses strtoul() to convert to unsigned int.

   Note that using base=0, strtoul() will recognize decimal, octal, and hex formats, but not binary. To convert from binary format use base=2 and skip the "0b" part, e.g. char *e; unsigned long int xl = strtoul("101",&e,2); will set xl to 5 and *e will be 0.

3. Displays an error message for bad arguments.

4. Displays the value in decimal, hex, and binary.

5. Displays the bit-reversed value in decimal, hex, and binary.

Assume that unsigned int uses 32 bits.

To check for strtoul() failure, #include <errno.h> and before calling strtoul() set errno=0; then after calling strtoul(), if errno is not zero call perror("strtoul");. For other bad arguments print an error message to standard error, i.e. fprintf( stderr, "format...", ...);

Test with some good arguments: 12 012 0x12 0b101100111
and bad arguments: 12efg 0129 0xefg 0b123 0xfffffffff 0xffffffffffffffffffffffffffff

Sample run:

 $ ./bits 0x1234 123abcefg 0b101100111000
 0x1234 = 4660 = 0x00001234 = 0b00000000000000000001001000110100
 bitrev = 742916096 = 0x2c480000 = 0b00101100010010000000000000000000

 convert: bad argument: 123abcefg
 123abcefg = 123 = 0x0000007b = 0b00000000000000000000000001111011
 bitrev = 3724541952 = 0xde000000 = 0b11011110000000000000000000000000

 0b101100111000 = 2872 = 0x00000b38 = 0b00000000000000000000101100111000
 bitrev = 483393536 = 0x1cd00000 = 0b00011100110100000000000000000000
 $

Programs must compile with no warnings or errors using: gcc -Wall

Each source file must start with a comment containing your name and a description.