A game for learning C operator precedence
source link: https://www.devever.net/~hl/cprec
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A game for learning C operator precedence
Have you ever added parentheses to a C expression because you weren't quite sure of operator precedence?
This is a game to learn C operator precedence. You must add parentheses to each subexpression without changing the meaning of the expression.
a ? b : c, -d with parentheses?
Type input and press Enter, or press Enter to skip.
Expression size (caution):
(If you really get stuck, your web browser's developer console may give some hints.)
Attempts made Total completed Skipped without trying
How it works
This was absurdly easy to make thanks to the excellent Tree-sitter library, which can parse practically any language and which supports WebAssembly. The game works by using a very simple custom generator to generate random C expressions, then parsing that expression using Tree-sitter. The user's input is also parsed and the two ASTs are compared. Fortunately, Tree-sitter does include parentheses expressions in its AST despite them being semantic noise, so checking that parentheses have been added by the user was also easy. Source code: just view source.
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