rcalc

Desktop calculator for Linux/Windows/macOS, inspired by the Windows Calculator (standard mode).

Built with Rust + Slint.

Run

cargo run --release
# or
./dist/rcalc

Icon (Linux / Wayland)

On Wayland the window icon property is ignored — the desktop uses .desktop + app_id. Install once:

./scripts/install-desktop.sh

Then start rcalc from the app menu (or ~/.local/bin/rcalc), not by clicking a random binary path, so KDE/GNOME can match app_id=rcalc to rcalc.desktop and show the icon.

Features

• Modes: Standard, Programmer, Convert
• Standard: + − × ÷, %, ±, 1/x, x², √x, memory
• Programmer: simultaneous HEX / DEC / OCT / BIN, sizes QWORD / DWORD / DINT / WORD / INT / BYTE, bitwise ops, clickable bits (WORD/DWORD — unsigned DEC; INT/DINT — signed)
• Convert: float32 ↔ two 16-bit words with endian AB CD / CD AB / BA DC / DC BA
• Convert → Ratio: float → minimal num/den for electronic gear (Byte≤255 / Word≤65535)
• Convert → ASCII: Char ↔ Hex ↔ Dec (control names for NUL…DEL)
• CRC: Modbus RTU CRC-16 + Modbus ASCII LRC from hex bytes (01 03 00 00 00 0A)
• Keyboard input

Project layout

• src/engine.rs — standard calculator logic
• src/programmer.rs — programmer mode logic
• src/convert.rs — float32 / word endian convert
• src/main.rs — UI wiring
• ui/app.slint — Slint interface
• dist/rcalc — release binary