实验结论
实验任务3
#ifndef COMPLEX_HPP #define COMPLEX_HPP #include <iostream> #include <cmath> using namespace std; class Complex{ public: Complex(double a=0,double b=0){ real=a; imag=b; } ~Complex(){} Complex(const Complex &c){ real=c.real; imag=c.imag; } double get_real()const; double get_imag()const; void show()const; void add(const Complex &c); friend Complex add(const Complex &c1,const Complex &c2); friend bool is_equal(const Complex &c1,const Complex &c2); friend double abs(Complex &c); private: double real,imag; }; double Complex::get_real() const{ return real; } double Complex::get_imag() const{ return imag; } void Complex::show() const{ using namespace std; if (imag>0) cout <<real<<"+"<<imag<<"i"; else if (imag<0) cout <<real<<imag<<"i"; else cout <<real; } void Complex::add(const Complex &c){ real+=c.get_real(); imag+=c.get_imag(); } Complex add(const Complex &c1,const Complex &c2){ Complex c; c.real=c1.real+c2.real; c.imag=c1.imag+c2.imag; return c; } bool is_equal(const Complex &c1,const Complex &c2){ if(c1.real==c2.real && c1.imag==c2.imag){ return true; }else return false; } double abs(Complex &c){ return sqrt(c.real*c.real+c.imag*c.imag); } #endif
#include "Complex.hpp" #include <iostream> int main() { using namespace std; Complex c1(6, -5); const Complex c2(3.6); Complex c3(c1); cout << "c1 = "; c1.show(); cout << endl; cout << "c2 = "; c2.show(); cout << endl; cout << "c2.imag = " << c2.get_imag() << endl; cout << "c3 = "; c3.show(); cout << endl; cout << "abs(c1) = "; cout << abs(c1) << endl; cout << boolalpha; cout << "c1 == c3 : " << is_equal(c1, c3) << endl; cout << "c1 == c2 : " << is_equal(c1, c2) << endl; Complex c4; c4 = add(c1, c2); cout << "c4 = c1 + c2 = "; c4.show(); cout << endl; c1.add(c2); cout << "c1 += c2, " << "c1 = "; c1.show(); cout << endl; }
实验任务4
#ifndef USER_HPP #define USER_HPP #include<iostream> #include <string> using namespace std; class User{ public: User(string name0,string passwd0="111111",string email0=""):name(name0),passwd(passwd0),email(email0){ ++n; } void set_email(); void change_passwd(); void print_info(); static void print_n(); private: string name; string passwd; string email; static int n; }; int User::n=0; void User::set_email(){ cout<<"Enter email address: "; cin>>email; cout<<"email is set successfully..."<<endl; } void User::change_passwd(){ cout<<"Enter old password: "; string passwd1; string passwd2; int i=1; for(i=1;i<=3;i++){ cin>>passwd1; if(passwd1!=passwd){ if(i<=2){ cout<<"password input error. Please re-enter again: "; } if(i==3){ cout<<"password input error. Pleasa try after a while."<<endl; } } else{ cout<<"Enter new passwd: "; cin>>passwd2; passwd=passwd2; cout<<"new passwd is set successfully..."<<endl; break; } } } void User::print_info(){ cout<<"name: "<<name<<endl; cout<<"passwd: ******"<<endl; cout<<"email: "<<email<<endl; } void User::print_n(){ cout<<"there are "<<n<<" users."; } #endif
#include "User.hpp" #include <iostream> int main() { using namespace std; cout << "testing 1......" << endl; User user1("Curry", "942030", "stc@nbastar.com"); user1.print_info(); cout << endl << "testing 2......" << endl << endl; User user2("James"); user2.change_passwd(); user2.set_email(); user2.print_info(); User::print_n(); }