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1、打印异常：仅打印浮点数异常，如图，现象1：打印异常时，定义一个全局float变量或删除一个全局float变量，打印正常；现象2：对打印异常变量直接赋值，打印仍然异常，对异常变量比较，比较结果和赋值数据比较结果一样
