wcal

A calculator write by rust

Allow operator: + - * / ( ).

Result can be i128 or f64. A warning will occur while result is i128 and division cast happened, such as 3/2=1.

This calculator has three steps: * Use logos to parse the expression to tokens. * Use a parser to parse tokens to a AST. * Calculate the result from the AST.

The following parser is available: * Top-down parser (default)

Usage

Command line mode

shell $ wcal "2*6+(1/2)" -f "2*6+(1/2)" i> 2*6+(1/2) Warning: division will cause a cast 12 f> 2*6+(1/2) 12.5 Default mod is i128, use -f to change to f64, use -i to change back.

Interactive mode

shell $ wcal i> help i Enter i128 mod f Enter f64 mod quit q Quit i> f Enter f64 mod f> 1/2 0.5 f> quit Bye!