语言
词法
letter→[a−zA−Z]digit→[0−9]number→digit+constInt→numbertrue→truefalse→falseconstString→"(char∣digit)∗"constFloat→number.numbervoid→voidreturn→returninteger→integerif→ifelse→elseelseif→elseiffor→forfunction→functionfunc→func==→==!=→!=<=→<=<→<>=→>=>→>+→+−→−∗→∗/→/∣→∣&→&!→!:=→:=(→()→)[→[]→]{→{}→};→;id→letter(letter∣digit)∗