Pascal 语言中，复合语句是用begin„ „ end 表示，条件语句的格式是if „ „ then„ „

else„ „ 表示，其中，else 子句可以出现也可以不出现。编一函数，检查Pascal 源文件

中的begin 和end 是否配对，if、then、else 是否配对。

输入：从名为pascal.in的文件中读入数据，该文件中即包含一个没有注释的pascal程序。

输出：输出文件名为pascal.out，如果if，then，else且begin和end配对，请输出“Match!”，否则输出“Error!”。-Pascal language, the compound statement is begin " "　end, said the format of a conditional statement is if " "　then " "　else " "　said one, else clause may appear or may not appear. Compile a function, check the Pascal source file begin and end is matched, if, then, else is paired. Input: from a file named pascal.in read data, the file that contains a no comment pascal program. Output: Output file name pascal.out, if the if, then, else, and begin and end pairing, the output " Match!" , Otherwise output " Error!" .