bitrepl

A REPL for bitwise and arithmetic operations. See results in hex, binary, and decimal (signed/unsigned) simultaneously.

Built for C systems programming courses.

Installation

pip install bitrepl

Usage

bitrepl

[32-bit] > 0xFF & 0x0F
$0:
  Hex:       0x0000000F
  Binary:    0000 0000 0000 0000 0000 0000 0000 1111
  Unsigned:  15
  Signed:    15

[32-bit] > ~0
$1:
  Hex:       0xFFFFFFFF
  Binary:    1111 1111 1111 1111 1111 1111 1111 1111
  Unsigned:  4294967295
  Signed:    -1

Features

• Multi-format output: Every result shows hex, binary, unsigned, and signed representations
• C-style operators: & | ^ ~ << >> + - * / %
• Number formats: Decimal (255), hex (0xFF), binary (0b1111), octal (0o17)
• Configurable bit width: 8, 16, 32, or 64 bits
• Result comparison: Compare multiple results side-by-side
• Variables: Store and reuse values

Commands

Variables

Reference previous results with $0, $1, etc:

[32-bit] > 0xFF
$0: ...

[32-bit] > $0 << 8
$1: ...

Store named variables:

[32-bit] > $mask = 0xFF
[32-bit] > 0xABCD & $mask

Comparison

Compare signed vs unsigned interpretation of the same bit pattern:

[8-bit] > 127
[8-bit] > 128
[8-bit] > :cmp
======================================================
COMPARISON:
------------------------------------------------------
          127                   128
------------------------------------------------------
Hex:      0x7F                  0x80
Binary:   0111 1111             1000 0000
Unsigned: 127                   128
Signed:   127                   -128
======================================================

License

MIT