Litera = "a" | "A" | "b" | "B" | "c" | "C" | "d" | "D" | "e" | "E" | "f" | "F" | "g" | "G" | "h" | "H" | "i" | "I" | "j" | "J" | "k" | "K" | "l" | "L" | "m" | "M" | "n" | "N" | "o" | "O" | "p" | "P" | "q" | "Q" | "r" | "R" | "s" | "S" | "t" | "T" | "u" | "U" | "v" | "V" | "w" | "W" | "x" | "X" | "y" | "Y" | "z" | "Z";
Cifra = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9";
Cifra_nenula = "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9";
Spatiu = "_" ;

Operator_unar = "&" | "*" | "+" | "-" | "!" | "-";
Operator_binar = "+" | "-" | "*" | "/" | "%" | "&" | "|" | "&&" | "||" | "^" | ">>" | "<<" || "<" | ">" | "<=" | ">=" || "==" || "!=";
Operator_postfixare = "++" | "--";
Operator_prefixare = "++" | "--";
Operator_atribuire = "=" | "+=" | "-=" | "/=" | "*=" | "|=" | "&=" | "^=";
Operand = Cifra_nenula , {Cifra} | {Litera};



Expresie = (Operator_unar ,Spatiu, Operand) | (Operand , Spatiu, Operator_binar , Spatiu , Operand) , Expresie;