构造函数实例

#include <iostream> #include <string> using namespace std; class Complex { private: double real, imag; public: Complex(double r); Complex(double r, double i); Complex(Complex c1, Complex c2); }; Complex::Complex(double r) //构造函数1 { real = r; imag = 100; cout << real << "--" << imag << endl; } Complex::Complex(double r, double i) //构造函数2 { real = r; imag = i; cout << real << "--" << imag << endl; } Complex::Complex(Complex c1, Complex c2) //构造函数3 { real = c1.real + c2.real; imag = c1.imag + c2.imag; cout << real << "--" << imag << endl; } int main() { Complex c0; //报错，没有无参构造函数（默认构造函数） Complex c1(3); //调用构造函数1，结果为：3--100 Complex c2(1, 2); //调用构造函数2，结果为：1--2 Complex c3(c1, c2); //调用构造函数3，结果为：4--102 Complex c4 = 5; //调用构造函数1，结果为：5--100 Complex c5 = { 10,15 };//调用构造函数2，结果为：10--15 return 0; }