实验二 类和对象（二）
1 #include <iostream> 2 #include <complex> 3 int main() 4 { 5 using namespace std; 6 complex<double> c1{3, 4}, c2{4.5}; 7 const complex<double> c3{c2}; 8 cout << "c1 = " << c1 << endl; 9 cout << "c2 = " << c2 << endl; 10 cout << "c3 = " << c3 << endl; 11 cout << "c3.real = " << c3.real() << endl; 12 cout << "c3.imag = " << c3.imag() << endl; 13 cout << "c1 + c2 = " << c1 + c2 << endl; 14 cout << "c1 - c2 = " << c1 - c2 << endl; 15 cout << "abs(c1) = " << abs(c1) << endl; 16 cout << boolalpha; 17 cout << "c1 == c2 : " << (c1 == c2) << endl; 18 cout << "c3 == c2 : " << (c3 == c2) << endl; 19 complex<double> c4 = 2; 20 cout << "c4 = " << c4 << endl; 21 c4 += c1; 22 cout << "c4 = " << c4 << endl; 23 }
试验任务一截图
1 #include <iostream> 2 #include <array> 3 template<typename T> 4 void output1(const T &obj) { 5 for(auto i: obj) 6 std::cout << i << ", "; 7 std::cout << "\b\b \n"; 8 } 9 template<typename T> 10 void output2(const T &obj) { 11 for(auto p = obj.cbegin(); p != obj.cend(); ++p) 12 std::cout << *p << ", "; 13 std::cout << "\b\b \n"; 14 } 15 int main() { 16 using namespace std; 17 array<int, 5> x1; 18 cout << "x1.size() = " << x1.size() << endl; 19 x1.fill(42); 20 x1.at(0) = 999; 21 x1.at(4) = -999; 22 x1[1] = 777; 23 cout << "x1: "; 24 output1(x1); 25 cout << "x1: "; 26 output2(x1); 27 array<double, 10> x2{1.5, 2.2}; 28 cout << "x2.size() = " << x2.size() << endl; 29 cout << "x2: "; 30 output1(x2); 31 array<int, 5> x3{x1}; 32 cout << boolalpha << (x1 == x3) << endl; 33 x3.fill(22); 34 cout << "x3: "; 35 output1(x3); 36 swap(x1, x3); 37 cout << "x1: "; 38 output1(x1); 39 cout << "x3: "; 40 output1(x3); 41 }
实验任务二截图
实验任务四
#include<iostream> #include<math.h> using namespace std; class Complex{ public: Complex (double x = 0, double y = 0) : real{x}, imag{y} {} Complex (const Complex &obj) : real{obj.real} , imag{obj.imag} {} double get_real() const { return real; } double get_imag() const { return imag; } void show() const { cout << real; if(imag > 0) cout << " + " << imag << "i"; else if(imag < 0) cout << " - " << -imag << "i"; } void add(const Complex &obj){ real += obj.get_real(); imag += obj.get_imag(); } friend Complex add(const Complex &a, const Complex &b){ return Complex(a.real + b.real, a.imag + b.imag); } friend bool is_equal(const Complex &a, const Complex &b){ return fabs(a.real - b.real) <= 1e-5 && fabs(a.imag - b.imag) <= 1e-5; } friend double abs(const Complex &obj){ return sqrt(obj.real * obj.real + obj.imag * obj.imag); } private: double real, imag; };
1 #include<iostream> 2 #include<math.h> 3 4 using namespace std; 5 6 class Complex{ 7 8 public: 9 10 Complex (double x = 0, double y = 0) : real{x}, imag{y} {} 11 Complex (const Complex &obj) : real{obj.real} , imag{obj.imag} {} 12 13 double get_real() const { return real; } 14 double get_imag() const { return imag; } 15 16 void show() const { 17 cout << real; 18 if(imag > 0) 19 cout << " + " << imag << "i"; 20 else if(imag < 0) 21 cout << " - " << -imag << "i"; 22 } 23 24 void add(const Complex &obj){ 25 real += obj.get_real(); 26 imag += obj.get_imag(); 27 } 28 29 friend Complex add(const Complex &a, const Complex &b){ 30 return Complex(a.real + b.real, a.imag + b.imag); 31 } 32 33 friend bool is_equal(const Complex &a, const Complex &b){ 34 return fabs(a.real - b.real) <= 1e-5 && fabs(a.imag - b.imag) <= 1e-5; 35 } 36 37 38 friend double abs(const Complex &obj){ 39 return sqrt(obj.real * obj.real + obj.imag * obj.imag); 40 } 41 42 private: 43 double real, imag; 44 };
截图
更换数组后的结果
实验任务五
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 5 class User{ 6 7 public: 8 9 User (string Name, string Passwd = "111111", string Email = "") 10 : name{Name} , passwd{Passwd}, email{Email} {n ++; } 11 12 void set_email(){ 13 cout << ("Enter email address: "); 14 cin >> email; 15 puts("email is set successfully..."); 16 } 17 18 void change_passwd(){ 19 20 string Passwd; 21 22 cout << ("Enter old password: "); 23 cin >> Passwd; 24 25 for(int wrong = 1; wrong <= 2 && Passwd != passwd; wrong ++){ 26 cout <<("password input error. Please re-enter again: "); 27 cin >> Passwd; 28 } 29 30 if(Passwd == passwd){ 31 cout << "Enter new passwd: "; 32 cin >> passwd; 33 puts("new passwd is set successfully..."); 34 } 35 else 36 puts("password input error. Please try after a while."); 37 38 } 39 40 void print_info(){ 41 cout << "name: " << name << "\n"; 42 cout <<"passwd: "; 43 44 for(int i = 0; passwd[i]; i ++) 45 cout << "*"; 46 cout << "\n"; 47 cout << "email: " << email << "\n"; 48 } 49 50 static void print_n(){ 51 cout << "there are " << n << " users.\n"; 52 } 53 54 private: 55 string name, passwd, email; 56 static int n; 57 }; 58 59 int User::n = 0;
1 #include<iostream> 2 #include"User.hpp" 3 4 void test(){ 5 6 7 using std::cout; 8 using std::endl; 9 10 cout << "testing 1......\n"; 11 12 User user1("Jonny", "92197", "xyz@hotmail.com"); 13 user1.print_info(); 14 15 cout << endl << "testing 2......\n\n"; 16 17 User user2("Leonard"); 18 user2.change_passwd(); 19 user2.set_email(); 20 user2.print_info(); 21 22 cout << endl; 23 User::print_n(); 24 25 26 } 27 28 int main(){ 29 test();
在更换一组信息过后
