// C++/Java assignment statement grammar
// supports multiple assignment operators within the same expression
//
// Remember that syntactically, it's ok to have
// while (a = b = c)
// It's a pretty good bet this isn't what you actually want,
// but it's legal. Thus, we have a separate production for
// <assignment statement>, the case where we want to end with a ";"

<assignment statement> ::= <assignment expression> ;
<assignment expression> ::= <variable> = <assignment expression>
			| <variable> = <term>
<term> ::= <variable> | <number>
<variable> ::= <identifier>