Warning: implicit declaration of function 'fmc_erase' is invalid in C99

引用\[1\]:告警类型：warning: implicit declaration of function 'gets' is invalid in C99 \[-Wimplicit-function-declaration\]。引用\[2\]:函数“gets”的隐式声明在C99中无效。引用\[3\]:如果只声明函数而没有定义函数（函数的具体实现部分），那么就会直接报错：Error: L6218E: Undefined symbol function“XXX” (referred from main.o)！如果没有声明，但是已经定义了函数，只是会出现警告：Warning: #223-D: function “XXX” declared implicitly！。

问题:Warning: implicit declaration of function 'fmc_erase' is invalid in C99
回答: 这个警告是在C99标准中隐式声明函数'fmc_erase'无效导致的。在C99标准中，如果只声明函数而没有定义函数，会直接报错。如果没有声明但已经定义了函数，只会出现警告。所以，为了避免这个警告，你需要在代码中显式地声明函数'fmc_erase'。
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