设计题三：条件语句的语法分析及语义分析程序设计。

1．目的

通过设计、编制、调试一个语法及语义分析程序，加深对语法及语义分析原理的理解。

-Design of title III: conditional statements syntax analysis and semantic analysis of program design. 1. Purpose through the design, development, debugging a syntax and semantic analysis procedures, better understanding of the syntax and semantic analysis to understand the principle.