#include <iostream>
using namespace std;
const double Pi=3.14;
class circle
{
double radius;//成员变量，radius代表圆的半径
public://类的访问控制，可以访问所有数据成员
void set_radius(double r)
{
radius=r;
}//成员函数
double get_radius()
{
return radius;//通过成员函数设置成员变量
}
double get_girth()
{
double girth;
girth=2*Pi*radius;
return girth;
}
double get_area()
{
double area;
area=Pi*radius*radius;
return area;
}
};
int main()
{
circle a;//用类定义对象
double radius;
cout<<"Please input the radius:";
cin>>radius;
a.set_radius(radius);Editor placeholder in source file
cout<<"The girth of circle is "<<a.get_girth()<<'\n';Editor placeholder in source file
cout<<"The area of circle is "<<a.get_area()<<'\n';Editor placeholder in source file
return 1;
}
不明白这个
a.set_radius(radius);Editor placeholder in source file
cout<<"The girth of circle is "<<a.get_girth()<<'\n';Editor placeholder in source file
cout<<"The area of circle is "<<a.get_area()<<'\n';Editor placeholder in source file
这些错误我该怎么做？ 我这是最新版的Xcode mac版本的