36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
/*
|
||
有一个类Circle，设计该类的类型转换函数，当将Circle对象转换成int型时，返回圆的半径；当将它转换成double型时，就返回圆的周长；当将它转换成float型时，就返回圆的面积。
|
||
*/
|
||
|
||
/*
|
||
|
||
类型转换函数没有参数。
|
||
类型转换函数没有返回类型。
|
||
类型转换函数必须返回将要转换成的type类型数据。
|
||
|
||
*/
|
||
|
||
#include <iostream>
|
||
using namespace std;
|
||
class Circle{
|
||
private:
|
||
double x,y,r;
|
||
public:
|
||
Circle(double x1,double y1,double r1){x=x1;y=y1;r=r1; }
|
||
operator int(){return int(r);}
|
||
operator double(){return 2*3.14*r;}
|
||
operator float(){return (float)3.14*r*r;}
|
||
};
|
||
int main(){
|
||
Circle c(2.3,3.4,2.5);
|
||
int r=c; //调用operator int()，将Circle类型转换成int
|
||
double length=c; //调用operator double()，转换成double
|
||
float area=c; //调用operator float()，将Circle类型转换成float
|
||
double len=(double) c; //将Cirlce类型对象强制转换成double
|
||
cout<<r<<endl;
|
||
cout<<length<<endl;
|
||
cout<<len<<endl;
|
||
cout<<area<<endl;
|
||
system("pause");
|
||
}
|