重載運算子 Complex 和 friend

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
class complex
  {
    double real,exp;
    public:
    complex(double r=0 , double e=0)
      {
        real=r;
        exp=e;
      }

    friend complex operator+(complex p, complex q)      // 加法
      { return complex(p.real+q.real , p.exp+q.exp);}
    friend complex operator+(complex p , float c)
      { return complex(p.real+c , p.exp+c);}
    friend complex operator+(float c , complex p)
      { return complex(c+p.real , c+p.exp);}

    friend complex operator-(complex p , complex q)     // 減法
      { return complex(p.real-q.real , p.exp-q.exp);}
    friend complex operator-(complex p , double c)
    { return complex(p.real-c , p.exp-c);}
    friend complex operator-(double c , complex p)
      { return complex(c-p.real , c-p.exp);}

    friend complex operator*(complex p , complex q)     // 乘法
      { return complex(p.real*q.real-p.exp*q.exp
                       , p.real*q.exp+p.exp*q.real);}
    friend complex operator*(complex p , double c)
      { return complex(p.real*c , p.exp*c);}
    friend complex operator*(double c , complex p)
      { return complex(c*p.real , c*p.exp);}

    friend complex operator/(complex p , complex q)     // 除法
      { return complex((p.real*q.real+p.exp*q.exp)
                       /(q.real+q.real+q.exp*q.exp)
                       , (p.exp*q.real-p.real*q.exp)
                       /(q.real*q.real+q.exp*q.exp));}
    friend complex operator/(complex p , double c)
      { return complex(p.real/c , p.exp/c);}
    friend complex operator/(double c , complex p)
      { return complex(c/p.real , c/p.exp);}
   void print();
  };

void main()
{
  clrscr();
  cout<<'\n';
  complex w(6,5) , r(4,3) , p;
  cout<<"      w=";
  w.print();
  cout<<"      r=";
  r.print();
  cout<<'\n';

  p=w+r;
    cout<<"  p=w+r=";
    p.print();
  p=p+3.0;
    cout<<"  p+3.0=";
    p.print();
  p=3.0+p;
    cout<<"  3.0+p=";
  p.print();
    cout<<'\n';

  p=w-r;
    cout<<"  p=w-r=";
    p.print();
  p=p-3.0;
    cout<<"  p-3.0=";
    p.print();
  p=3.0-p;
    cout<<"  3.0-p=";
    p.print();
    cout<<'\n';

  p=w*r;
    cout<<"  p=w*r=";
    p.print();
  p=r*5.4;
    cout<<"  r*5.4=";
    p.print();
  p=5.4*r;
    cout<<"  5.4*r=";
 p.print();
    cout<<'\n';

  p=w/r;
    cout<<"  p=w/r=";
    p.print();
  p=r/5.4;
    cout<<"  r/5.4=";
    p.print();
  p=5.4/r;
    cout<<"  5.4/r=";
    p.print();
}

void complex::print()                         // 輸出
 {
   //cout.setf(ios::showpos);
   //cout.width(5);
   //cout.precision(2);
   //cout.setf(ios::showpoint);
   //cout<<"("<<real<<','<<exp<<")"<<'\n';
    printf("(%5.2f,%5.2f)\n",real,exp);
 }
------------------------------------
輸出結果

      w=( 6.00, 5.00)
      r=( 4.00, 3.00)

  p=w+r=(10.00, 8.00)
  p+3.0=(13.00,11.00)
  3.0+p=(16.00,14.00)

  p=w-r=( 2.00, 2.00)
  p-3.0=(-1.00,-1.00)
  3.0-p=( 4.00, 4.00)

  p=w*r=( 9.00,38.00)
  r*5.4=(21.60,16.20)
  5.4*r=(21.60,16.20)

  p=w/r=( 2.29, 0.08)
  r/5.4=( 0.74, 0.56)
  5.4/r=( 1.35, 1.80)

--
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