咨询：三地址码赋值语法下第二个样例输出的解析树/推导

Let’s get this sorted out. To break down how your second sample output comes from the grammar, I need three key things from you:

• Your full set of BNF grammar rules for three-address code assignment operations (e.g., <assignment> → <variable> = <expression>, plus all expanded rules for non-terminals like <variable> or <expression>)
• The exact input statement of your second sample three-address code
• The specific output you’re trying to trace back to the grammar

Once you share these details, I’ll walk through the step-by-step derivation and lay out the parse tree structure so you can follow every logical step clearly.

内容的提问来源于stack exchange，提问作者user8874182