85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
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/*
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在C++的标准命名空间std中预定义了复数类Complex，
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并且通过友元重载了Complex的各种运算，包括本程序中重载的+、-、*、/。
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若使用using namespace std将std名字空间引入本程序，
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则本程序中的Complex将与std名字空间中的Complex类的运算符重载函数产生冲突，引起编译错误。
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*/
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/*
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对于不要求左值且可以交换参数次序的运算符（如+、-、*、/ 等运算符），
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最好用非成员形式（包括友元和普通函数）的重载运算符函数实现。
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*/
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//解决前面的2+b问题。
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#include<iostream>
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class Complex{
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private:
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double r,i;
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public:
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Complex(double R=0,double I=0):r(R),i(I){};
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friend Complex operator+(Complex a, Complex b);
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friend Complex operator-(Complex a, Complex b);
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friend Complex operator*(Complex a, Complex b);
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friend Complex operator/(Complex a, Complex b);
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friend Complex operator+(Complex a,double b){
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return Complex(a.r+b,a.i);
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}
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friend Complex operator+(double a,Complex b){
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return Complex(a+b.r,b.i);
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}
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void display();
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};
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Complex operator+(Complex a, Complex b){
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return Complex(a.r+b.r,a.i+b.i);
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}
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Complex operator-(Complex a, Complex b){
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return Complex(a.r-b.r,a.i-b.i);
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}
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Complex operator*(Complex a, Complex b){
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Complex t;
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t.r = a.r*b.r-a.i*b.i;
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t.i = a.r*b.i+a.i*b.r;
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}
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Complex operator/(Complex a, Complex b){
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Complex t;
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double x;
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x = 1/(b.r*b.r+b.i*b.i);
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t.r = x*(a.r*b.r+a.i*b.i);
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t.i = x*(a.i*b.r-a.r*b.i);
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return t;
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}
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void Complex::display(){
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std::cout<<r;
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if(i>0)
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std::cout<<"+";
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if(i!=0)
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std::cout<<i<<"i"<<std::endl;
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}
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int main(void) {
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Complex c1(1,2),c2(3,4),c3,c4,c5,c6;
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Complex a,b(2,3);
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Complex a1=b+2;
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Complex a2=2+b;
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a1.display();
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a2.display();
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c3=c1+c2;
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c4=c1-c2;
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c5=c1*c2;
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c6=c1/c2;
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c1.display();
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c2.display();
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c3.display();
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c4.display();
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c5.display();
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c6.display();
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system("pause");
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return 0;
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}
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