复数类重载主要实现二元操作符（参数中有一个该类的对象）‘+’、‘-’和一元操作符（参数中没有该类的对象）、‘-a’（取负）。
代码：
#include <iostream>
using namespace std ;
class complex
{
public:
complex() {
}
complex(int r, int i) {real=r; p_w_picpath=i;}
complex(const complex&) ;
complex operator +(const complex&);
complex operator -(const complex&);
complex operator -();
void print();
private:
int real, p_w_picpath;
};
complex::complex(const complex &c)
{
real = c.real;
p_w_picpath = c.p_w_picpath;
}
complex complex::operator +(const complex &c )
{
real += c.real;
p_w_picpath += c.p_w_picpath;
return *this;
}
complex complex::operator -(const complex &c )
{
complex temp;
temp.real = real - c.real;
temp.p_w_picpath= p_w_picpath - c.p_w_picpath ;
return temp;
}
complex complex::operator-()
{
real *= -1;
p_w_picpath *=-1;
return *this;
}
void complex::print()
{
cout << real;
if(p_w_picpath>0) cout << "+" << p_w_picpath << "i" << endl;
else if(p_w_picpath<0) cout << p_w_picpath << "i" << endl ;
else cout << endl ;
}
int main()
{
complex obj(1,2), obj1(1,-2);
obj.print() ;
obj1.print() ;
obj = obj + obj1 ;
obj.print() ;
obj = obj-obj1 ;
obj.print() ;
(-obj).print();
return 0 ;
}
