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请使用VC6或使用[答题]菜单打开考生文件夹proj1下的工程proj1，此工程中含有一个源程序文件proj1.cpp。其中每个注释“//ERROR found”之后的一行语句存在错误。请改正这些错误，使程序的输出结果为： The perimeter is 62.8 The area is 314 注意：只修改注释“//ERROR found”的下一行语句，不要改动程序中的其他内容。 // proj1.cpp #include ＜iostream＞ using namespace std; const double PI=3.14; class Circle { public: // ERROR found Circle(int r) { radius =r; } void Display(); private: const int radius; }; //ERROR found**** void Display() { cout ＜＜"The perimeter is" ＜＜2* PI * radius ＜＜ endl; cout ＜＜"The area is" ＜＜PI* radius* radius ＜＜endl; } int main() { Circle c(10); //ERROR found c::Display(); return 0; }

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