复数类重载加法、减法和乘法运算符

以下定义了一个复数类及其部分实现，现要求将类的构造函数以及运算符+、- 和 * 函数重载补充完整。

复数类定义：

在这里描述复数类定义。具体如下：
class complex {
	public:
		complex(float r=0,float i=0);                   // 构造函数
		complex operator+(const complex &op2) const;    //重载运算符 +
		complex operator-(const complex &op2) const;    //重载运算符 -
		complex operator*(const complex &op2) const;    //重载运算符 *
		void display() const;                           // 按数学写法输出复数
	private:
		float real;
		float imag;
};
 

裁判测试程序样例：

在这里给出复数类测试的例子。例如：
#include <iostream>
using namespace std;
class complex {
	public:
		complex(float r=0,float i=0);                   // 构造函数
		complex operator+(const complex &op2) const;    //重载运算符 +
		complex operator-(const complex &op2) const;    //重载运算符 -
		complex operator*(const complex &op2) const;    //重载运算符 *
		void display() const;                           // 按数学写法输出复数
	private:
		float real;
		float imag;
};
/* ------------------- 请在这里填写答案--------------------  */
void complex::display() const {

if(real&&imag)

if(imag1||imag-1)

cout<<real<<(imag>0?"+":"-")<<"i"<<endl;

else

cout<<real<<(imag>0?"+":"")<<imag<<"i"<<endl;

else if(real)

cout<<real<<endl;

else if (imag)

if(imag1||imag-1)

cout<<(imag>0?"":"-")<<"i"<<endl;

else

cout<<imag<<"i"<<endl;

else

cout<<0<<endl;

}
int main() {

double real,imag;

complex c,d,e;
<span class="hljs-built_in">cin</span>&gt;&gt;real&gt;&gt;imag;
<span class="hljs-function"><span class="hljs-built_in">complex</span> <span class="hljs-title">c1</span><span class="hljs-params">(real,imag)</span></span>;
<span class="hljs-built_in">cin</span>&gt;&gt;real&gt;&gt;imag;
<span class="hljs-function"><span class="hljs-built_in">complex</span> <span class="hljs-title">c2</span><span class="hljs-params">(real,imag)</span></span>;

c=c1+c2;
d=c1-c2;
e=c1*c2;
c.<span class="hljs-built_in">display</span>() ;
d.<span class="hljs-built_in">display</span>() ;
e.<span class="hljs-built_in">display</span>();

<span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;

}

 

输入样例：

在这里给出一组输入。例如：

2 3
-4 -5
 

输出样例：

在这里给出相应的输出。例如：

-2-2i
6+8i
7-22i
 

正确代码：

complex::complex(float r,float i){
    real = r;
    imag = i;
}
complex complex::operator+(const complex &op2) const{
    complex temp;
    temp.imag = this->imag + op2.imag;
    temp.real = this->real + op2.real;
    return temp;
}
complex complex::operator-(const complex &op2) const{
    complex temp;
    temp.imag = this->imag - op2.imag;
    temp.real = this->real - op2.real;
    return temp;
}
complex complex::operator*(const complex &op2) const{
    complex temp;
    temp.imag = this->imag * op2.real+this->real*op2.imag;
    temp.real = this->real * op2.real-this->imag*op2.imag;
    return temp;
}