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当我在IAR中调用abs()函数时，出现如下警告
Warning[Pe223]: function "abs" declared implicitly
请问这是什么问题呢，怎么在IAR编译器中求一个变量的绝对值呢
abs函数的参数类型，是不是有要求的
是整型啊
你可以添加stdlib.h这个头文件试试
