class circle{public: double r; double pi = 3.1415926; double area = pi*r*r;};//2010编译不通过 2013编译能通过 但是运行结果不是正确的int main03{ circle c1; cout << "input r" << endl; cin >> c1.r; cout << c1.area << endl;//乱码 system("pause"); return 0;
}