使用类型转换函数的简单例子

 1 #include <iostream>
 2 
 3 /* run this program using the console pauser or add your own getch, system("pause") or input loop */
 4 using namespace std;
 5 class Complex
 6 {
 7     public:
 8         Complex(){
 9             real=0;
10             imag=0;
11         }
12         Complex(double r,double i){
13             real=r;
14             imag=i;
15         }
16         operator double(){
17             return real;
18         }
19     private:
20         double real;
21         double imag;
22 };
23 
24 int main(int argc, char** argv) {
25     Complex c1(3,4),c2(5,-10),c3;
26     double d;
27     d=2.5+c1;
28     cout<<d<<endl;
29     return 0;
30 }