实验二
实验任务四
Complex.hpp
1 #include<iostream> 2 #include<cmath> 3 4 using std::cout; 5 using std::endl; 6 7 class Complex { 8 public: 9 //构造函数 10 Complex(float r = 0, float i = 0) : real{ r }, imag{ i } {} 11 Complex(const Complex & obj) : real{ obj.real }, imag{ obj.imag } {} 12 13 public: 14 //普通成员函数 15 float get_real() const { return real; } 16 float get_imag() const { return imag; } 17 void show() const; 18 void add(const Complex & obj); 19 20 //友元函数 21 friend Complex add(const Complex & c1, const Complex & c2); 22 friend bool is_equal(const Complex & c1, const Complex & c2); 23 friend double abs(const Complex & obj); 24 25 private: 26 float real; 27 float imag; 28 }; 29 30 //成员函数的实现 31 void Complex::show() const { 32 //各种情况复数输出 33 if (real != 0 && imag > 0) { 34 cout << real << " + " << imag << "i"; 35 } 36 else if (real != 0 && imag < 0) 37 { 38 cout << real << " - " << abs(imag) << "i"; 39 } 40 else if (real == 0 && imag != 0) 41 { 42 cout << imag << "i"; 43 } 44 else 45 { 46 cout << real; 47 } 48 49 } 50 51 void Complex::add(const Complex & obj) { 52 real += obj.real; 53 imag += obj.imag; 54 } 55 56 57 //友元函数的实现 58 Complex add(const Complex & c1, const Complex & c2) { 59 return Complex(c1.real + c2.real, c1.imag + c2.imag); 60 } 61 62 bool is_equal(const Complex & c1, const Complex & c2) { 63 return (c1.real == c2.real) && (c1.imag == c2.imag); 64 65 } 66 67 double abs(const Complex & obj) { 68 return sqrt(obj.real * obj.real + obj.imag * obj.imag); 69 70 }
task4.cpp
1 #include "Complex.hpp" 2 #include <iostream> 3 4 // 类测试 5 void test() { 6 using namespace std; 7 8 Complex c1(3, -4); 9 const Complex c2(4.5); 10 Complex c3(c1); 11 12 cout << "c1 = "; 13 c1.show(); 14 cout << endl; 15 16 cout << "c2 = "; 17 c2.show(); 18 cout << endl; 19 cout << "c2.imag = " << c2.get_imag() << endl; 20 21 cout << "c3 = "; 22 c3.show(); 23 cout << endl; 24 25 cout << "abs(c1) = "; 26 cout << abs(c1) << endl; 27 28 cout << boolalpha; 29 cout << "c1 == c3 : " << is_equal(c1, c3) << endl; 30 cout << "c1 == c2 : " << is_equal(c1, c2) << endl; 31 32 Complex c4; 33 c4 = add(c1, c2); 34 cout << "c4 = c1 + c2 = "; 35 c4.show(); 36 cout << endl; 37 38 c1.add(c2); 39 cout << "c1 += c2, " << "c1 = "; 40 c1.show(); 41 cout << endl; 42 } 43 44 int main() { 45 test(); 46 }
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实验任务五
User.hpp
1 #include<iostream> 2 #include<string> 3 4 using std::cout; 5 using std::cin; 6 using std::endl; 7 using std::string; 8 9 class User{ 10 public: 11 User(string n, string p = "111111", string e = ""); 12 void set_email() ; 13 void change_passwd(); 14 void print_info(); 15 static void print_n() { cout << "there are " << count << " users" <<endl; } 16 17 public: 18 static int count; 19 20 private: 21 string name; 22 string passwd; 23 string email; 24 }; 25 26 int User::count = 0; 27 28 User::User(string n, string p /*= "111111"*/, string e /*= "111111"*/){ 29 name = n; 30 passwd = p; 31 email = e; 32 count++; 33 } 34 35 void User::set_email() { 36 string s1; 37 cout << "Enter email address: "; 38 cin >> s1; 39 email = s1; 40 cout << "email is set successfully..." << endl; 41 } 42 43 void User::change_passwd() { 44 cout << "Enter old password: "; 45 int times = 0; 46 while(times < 3){ 47 string s1; 48 cin >> s1; 49 if(s1 == passwd){ 50 cout << "Enter new passwd: "; 51 string s1; 52 cin >> s1; 53 passwd = s1; 54 cout << "new passwd is set successfully..." << endl; 55 break; 56 } 57 if(times < 2) 58 cout << "password input error. Please re-enter again:"; 59 times++; 60 } 61 if(times >= 3) cout << "passwd input error. Please try affter a while." << endl; 62 } 63 64 void User::print_info(){ 65 cout << "name: " << name << endl; 66 cout << "passwd: "; 67 string s1(passwd.length(), '*'); 68 cout << s1 << endl; 69 cout << "email: " << email << endl; 70 }
task5.cpp
1 #include "User.hpp" 2 #include <iostream> 3 4 // 测试User类 5 void test() { 6 using std::cout; 7 using std::endl; 8 9 cout << "testing 1......\n"; 10 User user1("Jonny", "92197", "xyz@hotmail.com"); 11 user1.print_info(); 12 13 cout << endl 14 << "testing 2......\n\n"; 15 16 User user2("Leonard"); 17 user2.change_passwd(); 18 user2.set_email(); 19 user2.print_info(); 20 21 cout << endl; 22 User::print_n(); 23 } 24 25 int main() { 26 test(); 27 }
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