复数加法和使用复制构造函数

Question

#include<iostream>
using namespace std;
class complex
{
    float real,imag;
public:
    
    complex(complex &c)
    {
        cout<<"copy constructor"<<endl;
        real=c.real;
        imag=c.imag;

    }
    void showData()
    {
        count<<"the sum is"<<endl;
        cout<<real<<"+i"<<imag<<endl;
    }

    complex addition(complex x,complex y)
    {
        complex temp;
        temp.real=x.real+y.real;
        temp.imag=x.imag+x.imag;
        return temp;
    }
};

int main()
{
    complex c2(2,3),c3(c2),c1;
    c2.showData();
    c3.showData();
    c1=c1.addition(c2,c3);
    c1.showData();
    return 0;
}

我想通过从对象传递值并使用复数复制相同的值来添加复数。这是我得到的错误：

Error:C:\Users\Santosh\Documents\cplusplus\complex_addition.cpp|48|error: no matching function for call to 'complex::complex()'|

Answer 1

编译器认为 complex c2(2,3) 正在尝试调用“()”运算符。您尚未定义采用两个整数的构造函数。

Answer 2

complexclass需要定义两个构造函数来解决：

complex() {}
complex(float rl, float im) : real(rl), imag(im) {}

该值从未被初始化，因为没有构造函数将 2 和 3 分别放入 real 和 imag。 class 对象 c1 将需要 complex() {} 构造函数。

Answer 3

这对我有用。

#include<iostream>
using namespace std;
class complex
{
    float real,imag;
public:
    complex()
    {
        cout<<"default constructor"<<endl;
        real=0;
        imag=0;
    }
   complex(float r, float i)

    {
    cout<<"parameterized construction";
    real=r;
    imag=i;
    }
    complex(complex &c)
    {
        cout<<"copy constructor"<<endl;
        real=c.real;
        imag=c.imag;

    }
    void getData()
    {
        cout<<"the complex number are: "<<real<<"+"<<imag<<"i"<<endl;

    }
    void showData()
    {
        cout<<"the sum is: ";
        cout<<real<<"+"<<imag<<"i"<<endl;
    }

    complex addition(complex x,complex y)
    {
        complex temp;
        temp.real=x.real+y.real;
        temp.imag=x.imag+x.imag;
        return temp;

    }
};



int main()
{
    complex c2(2,3),c3(c2),c1;
    c2.getData();
    c3.getData();
    c1=c1.addition(c2,c3);
    c1.showData();


    return 0;

}

复数加法和使用复制构造函数

complex number addition and using copy constructor

c++

constructor

complex-numbers