<expression> :
<expression>-<arithmetic expression>|<relational expression>|<Boolean expression>|<assignment expression>
<arithmetic expression>
<arithmetic expression> -> <arithmetic expression> + <term> | <arithmetic expression> - <term>|<term>
<term> -> <term>* <factor>|<term>/<factor>|<term>%<factor><factor>
<factor> -> (<arithmetic expression>)<constant>|<variable>|<function call>
<constant> -> <numeric constant> <character constant>
<variable> -> <identifier>
<function call> -> <identifier>(<argument list>)
<argument list> -> <argument>|e
<actual parameter> -> <expression>|<expression>,<actual parameter>
<relational expression>
<relational expression> -> <arithmetic expression><relational operator>arithmetic expression>
<relational operator> -> > |<|>= l <= | == | !=
<Boolean expression>
<Boolean expression> -> <Boolean expression> || <Boolean term>|<Boolean term>
<Boolean term> -> <Boolean term> && <Boolean factor>|<Boolean factor>
<Boolean Factor> -> <Arithmetic Expression>|<Relational Expression>|!<Boolean Expression>
<assignment expression>
<assignment expression> -> <identifier>=<expression>
<statement>
<statement> -> <declaration statement>|<execution statement>
<declaration statement>
<declaration statement> -> <value declaration>|<function declaration>|e
<value declaration> -> <constant declaration>|<variable declaration>
<constant declaration> -> const <constant type><constant declaration table>
<constant type> -> int | char | float
<constant declaration> -> <identifier> = <constant>;|<identifier> = <constant>,<constant declaration>
<variable declaration> -> <variable type> <variable declaration table>
<variable declaration table> -> <single variable declaration>;|<single variable declaration>,<variable declaration table>
<single variable declaration> -> <variable>|<variable> = <expression>
<variable type> -> int | char | float
<function declaration> -> <function type> <identifier>(<function declaration parameter list>);
<function type> -> int | char | float | void
<function declaration parameter list> -> <function declaration parameter>|e
<function declaration parameter> -> <variable type>|<variable type>,<function declaration parameter>
<execute statement>
<execution statement> -> <data processing statement>|<control language>|<compound language>
<data processing statement> -> <assignment statement>|<function call statement>
<assignment statement> -> <assignment expression>;
<function call statement>-<function call>;
<control statement> -> <if statement>|<for statement>|<while statement> | <do while statement> l <return statement>
<compound statement> -> {<statement list>}
<statement list> -> <statement> | <statement><statement list>
<if statement> -> if (<expression>)<statement>| if (<expression>)<statement> else <statement>
< for statement> -> for (<expression>;<expression>;<expression>)<loop statement>
<while statement> -> while (<expression>)<loop statement>
< do while statement> -> do<looping compound> while (<expression>);
<loop statement> -> <declaration statement>|<loop execution statement> | <compound statement for loop>
<compound statement for loop> -> {<loop statement list>}
<loop statement> -> <loop statement>|<loop statement><loop statement>
<loop execution statement> -> <if statement for loop>|<for statement>|<while statement><do while statement><return statement>l<break statement>l<continue statement>
<if statement for loop> -> if (<expression>)<loop statement>|if (<expression>)<loop statement> else <loop statement>
<return statement> -> return; | return <expression>;
<break statement> -> break;
<continue statement> -> continue;
<function definition>
<function definition> -> <function type> <identifier>(<function definition parameter list>) <compound statement>
<function definition parameter list> -> <function definition parameter>|e
<function definition parameter> -> <variable type> <identifier>|<variable type> <identifier>,<function definition parameter>
<program>
<program> -> <declaration statement> main() <compound statement> function block>
<function block> -> <function definition><function block>|e
