0143928--皮丽莉--c++作业

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#include <iostream>#include <cmath>using namespace std;#define MAXLEN 100class Complex{double re;//实部 double im;//虚部 public:Complex(double x=.0,double y=.0):re(x),im(y){}void display() const;//作为成员函数来重载运算符 Complex operator +(const Complex& z){return Complex(re +z.re,im+z.im);//重载为类的友元函数 }};void Complex::display() const{cout<<re;if(fabs(im)<1e-9)return;cout<<"+"<<im<<"i";}int main (){Complex z1(1.0,2.0);Complex z2(3.0,4.0);z1.display();cout<<" ";z2.display();cout<<" ";Complex z3;z3=z1+z2;//z1.operator +(z2)z3.display();    cout<<endl;return 0;}#include <iostream>using namespace std;class String{private:    char *s;public:String ();String(int n);String (const String& z);String& operator=(const String& s);friend String operator +(const String&s1,const String&s2);friend bool operator <(const String&s1,const String&s2);friend bool operator <=(const String&s1,const String&s2);friend bool operator ==(const String&s1,const String&s2);friend bool operator >(const String&s1,const String&s2);friend bool operator >=(const String&s1,const String&s2);friend bool operator !=(const String&s1,const String&s2);}/* run this program using the console pauser or add your own getch, system("pause") or input loop */#include "mystring.h"int main(){String s1;String s2(10);String s3(s1);}String{char *s;public:String ();String(const char* str);String (int n);String (const String&s2);friend}#include "mystring.h"#include <cstring>String::String(){s=new char[100];s[0]='\0';}String::String(int n){s=new char[100];s[0]='\0';}String::String(const String& s2){  s=new char[strlen(s2.s)+1];  s[0]='\0';//表示是一个空的字符串   strcpy(s2.s);  }String::~String(){if(s!=NULL)delet s;s=NULL;}ostream& operator<<(ostream& os,const String& str){os<<str.os；}#include <iostream>using namespace std;class Complex{public:Complex() {real=0;imag=0;}Complex(double r,double i) {real=r;imag=i;}Complex complex_add(Complex &c2);void display();private:double real;double imag; } ;  Complex Complex::complex_add(Complex &c2) {Complex c; c.real=real+c2.real; c.imag=imag+c2.imag; return c; } void Complex::display() {cout<<"("<<real<<","<<imag<<"i)"<<endl; }  int main(){ Complex c1(3,4),c2(5,-10),c3; c3=c1.complex_add(c2); cout<<"c1=";c1.display(); cout<<"c2=";c2.display(); cout<<"c1+c2=";c3.display(); return 0; }
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