题目内容

若有以下程序void f(int n);main(){ void f(int n);f(5);}void f(int n){ printf("%d\n",n); }则以下叙述中不正确的是

A. 若只在主函数中对函数f进行说明，则只能在主函数中正确调用函数f
B. 若在主函数前对函数f进行说明，则在主函数和其后的其它函数中都可以正确调用函数f
C. 对于以上程序，编译时系统会提示出错信息：提示对f函数重复说明
D. 函数f无返回值，所以可用void将其类型定义为无值型

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