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求助:错误#28 expression must have a constant value

我在main.c中定义了

float    LaserTemperature=BaseTemp;

BaseTemp是在sys.h中声明的常量。

然后我在key.c中成功调用LaserTemperature 调用程序:

extern float  LaserTemperature;

但是在LCD.c中却提示#28 expression must have a constant value 同样的调用程序

extern float LaserTemperature;