If a variable is used before it is initialized, a semantic error is generated, the variable is created with a value of zero, and a message is printed.
如果变量是在初始化之前使用的，那就会产生语义错误，使用值为0来创建这个变量，并打印一条消息。
If a variable is used before it is initialized, a semantic error is generated, the variable is created with a value of zero, and a message is printed.
如果变量是在初始化之前使用的，那就会产生语义错误，使用值为0来创建这个变量，并打印一条消息。
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