题目内容

下列说法错误的是（）。

A. 函数既可以嵌套定义，也可以嵌套调用。
B. 形参也是局部变量，形参变量和实参变量的作用域是不同的，因此形参变量和实参变量同名时，二者互不干扰。
C. 在函数调用时函数的形参和实参分别占用不同的存储单元。
D. 并不是任何情况下都需要对所调用的函数进行声明。

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