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实验1 类与对象

时间：2023-10-19 22:15:20浏览次数：29  
标签：const 对象 void float int Complex 实验 Rect

实验任务1 源代码： 

  1 #include<iostream>
  2 #include<string>
  3 #include<vector>
  4 #include<array>
  5 
  6 
  7 template<typename T>
  8 void output1(const T &obj){
  9     for(auto i: obj)
 10         std::cout << i << ", ";
 11     std::cout << "\b\b \n";
 12 }
 13 
 14 
 15 
 16 template<typename T>
 17 void output2(const T &obj){
 18     for(auto p = obj.begin(); p != obj.end(); ++p)
 19         std::cout << *p << ", ";
 20     std::cout << "\b\b \n";
 21 }
 22 
 23 
 24 
 25 void test_array(){
 26     using namespace std;
 27     
 28     array<int, 5> x1;
 29     cout << "x1.size()= " << x1.size() << endl;
 30     x1.fill(42);
 31     x1.at(0) = 999;
 32     x1[4] =-999;
 33     cout << "x1: ";
 34     output1(x1);
 35     cout << "x1: ";
 36     output2(x1);
 37     
 38     
 39     array<int, 5> x2(x1);
 40     cout << boolalpha << (x1 == x2) << endl;
 41     x2.fill(22);
 42     cout << "x2: ";
 43     output1(x2);
 44     
 45     
 46     swap(x1,x2);
 47     cout << "x1: ";
 48     output1(x1);
 49     cout << "x2: ";
 50     output1(x2);
 51 }
 52 
 53 
 54 void test_vector(){
 55     using namespace std;
 56     
 57     vector<int> v1;
 58     cout << v1.size() << endl;
 59     cout << v1.max_size() << endl;
 60     v1.push_back(55);
 61     cout << "v1: ";
 62     output1(v1);
 63     
 64     vector<int> v2 {1, 0, 5, 2};
 65     v2.pop_back();
 66     v2.erase(v2.begin());
 67     v2.insert(v2.begin(), 999);
 68     v2.insert(v2.end(), -999);
 69     cout << v2.size() << endl;
 70     cout << "v2: ";
 71     output2(v2);
 72     
 73     vector<int> v3(5, 42);
 74     cout << "v3: ";
 75     output1(v3);
 76     
 77     vector<int> v4(v3.begin(), v3.end()-2);
 78     cout << "v4: ";
 79     output1(v4);
 80 }
 81 
 82 
 83 void test_string(){
 84     using namespace std;
 85     
 86     string s1{"oop"};
 87     cout << s1.size() << endl;
 88     for(auto &i: s1)
 89         i -= 32;
 90     s1 += "2023";
 91     s1.append(", hello");
 92     cout << s1 << endl;
 93 }
 94 
 95 int main(){
 96     using namespace std;
 97     
 98     cout << "===========测试1: array模板类基础用法===========" << endl;
 99     test_array();
100     
101     cout << "\n===========测试2: vector类基础用法===========" << endl;
102     test_vector();
103     
104     cout << "\n===========测试3: string类基础用法===========" << endl;
105     test_string(); 
106 }
View Code

运行测试截图：

实验任务2 源代码： 
 1 #include <iostream>
 2 #include <complex>
 3 void test_std_complex() {
 4 using namespace std;
 5 complex<double> c1{3, 4}, c2{4.5};
 6 const complex<double> c3{c2};
 7 cout << "c1 = " << c1 << endl;
 8 cout << "c2 = " << c2 << endl;
 9 cout << "c3 = " << c3 << endl;
10 cout << "c3.real = " << c3.real() << ", " << "c3.imag = " << c3.imag()
11 << endl;
12 cout << "c1 + c2 = " << c1 + c2 << endl;
13 cout << "c1 - c2 = " << c1 - c2 << endl;
14 cout << "abs(c1) = " << abs(c1) << endl; 
15 
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 }
24 int main() {
25 test_std_complex();
26 }
View Code

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实验任务3 源代码： 
 1 #include <iostream>
 2 #include <string>
 3 using namespace std;
 4 class T {
 5 public:
 6 T(int x = 0, int y = 0); 
 7 T(const T &t); 
 8 T(T &&t); 
 9 ~T(); 
10 void set_m1(int x); 
11 int get_m1() const; 
12 int get_m2() const; 
13 void display() const; 
14 friend void func(); 
15 private:
16 int m1, m2;
17 public:
18 static void disply_count(); 
19 public:
20 static const string doc; 
21 static const int max_count; 
22 private:
23 static int count; 
24 };
25 
26 const string T::doc{"a simple class"};
27 const int T::max_count = 99;
28 int T::count = 0;
29 
30 T::T(int x, int y): m1{x}, m2{y} {
31 ++count;
32 cout << "constructor called.\n";
33 }
34 T::T(const T &t): m1{t.m1}, m2{t.m2} {
35 ++count;
36 cout << "copy constructor called.\n";
37 }
38 T::T(T &&t): m1{t.m1}, m2{t.m2} {
39 ++count;
40 cout << "move constructor called.\n";
41 }
42 T::~T() {
43 --count;
44 cout << "destructor called.\n";
45 }
46 void T::set_m1(int x) {
47 m1 = x;
48 }
49 int T::get_m1() const {
50 return m1;
51 }
52 int T::get_m2() const {
53 return m2;
54 }
55 void T::display() const {
56 cout << m1 << ", " << m2 << endl;
57 }
58 
59 void T::disply_count() {
60 cout << "T objects: " << count << endl;
61 }
62 
63 void func() {
64 T t1;
65 t1.set_m1(55);
66 t1.m2 = 77; 
67 t1.display();
68 }
69 
70 void test() {
71 cout << "T class info: " << T::doc << endl;
72 cout << "T objects max_count: " << T::max_count << endl;
73 T::disply_count();
74 T t1;
75 t1.display();
76 t1.set_m1(42);
77 T t2{t1};
78 t2.display();
79 T t3{std::move(t1)};
80 t3.display();
81 t1.display();
82 T::disply_count();
83 }
84 
85 int main() {
86 cout << "============测试类T============" << endl;
87 test();
88 cout << endl;
89 cout << "============测试友元函数func()============" << endl;
90 func();
91 }
View Code

运行测试截图：

实验任务4 源代码： 
 1 # include<iostream>
 2 # include<string>
 3 # include<iomanip>
 4 using namespace std;
 5 class Rect{
 6 public:
 7     Rect(float l = 2.0 , float w = 1.0);
 8     Rect(const Rect &r);
 9     float area() const;
10     float circumference() const;
11     void resize(float times);
12     void resize(float l_times,float w_times);  
13 private:
14     float length , width;    
15 public:
16     static void size_info();    
17 public:
18     static const string doc;    
19 private:
20     static int size;   
21 }; 
22 const string Rect::doc{"a simple Rect class"};
23 int Rect::size = 0;
24 Rect::Rect(float l,float w):length{l},width{w}{++size;}
25 Rect::Rect(const Rect &r):length{r.length},width{r.width}{++size;}
26 Rect::~Rect(){--size;}
27 float Rect::len() const {return length;}
28 float Rect::wide() const{return width;}
29 float Rect::area() const {return length*width;}
30 float Rect::circumference() const {return 2*(length+width);}
31 void Rect::resize(float times){
32     length = length*times;
33     width = width*times;    
34 }
35 void Rect::resize(float l_times,float w_times){
36     length = length*l_times;
37     width = width*w_times;
38 }
39 void Rect::size_info(){
40     cout << size;
41 }
42 void output(const Rect &r){
43     cout << "矩形信息：" << endl;
44     cout << fixed << setprecision(2);
45     cout << left << setw(10) << "长：" << r.len() << endl;
46     cout << left << setw(10) << "宽：" << r.wide() << endl;
47     cout << left << setw(10) << "面积：" << r.area() << endl;
48     cout << left << setw(10) << "周长：" << r.circumference() << endl;     
49 }
50 void test(){
51     cout << "矩形类信息：" << Rect::doc << endl;
52     cout << "当前矩形对象数目：";
53     Rect::size_info() ;
54     cout << endl;
55     Rect r1;
56     output(r1);
57     
58     Rect r2(4,3);
59     output(r2);
60     
61     Rect r3(r2);
62     r3.resize(2);
63     output(r3);
64     r3.resize(5,2); 
65     output(r3);
66     cout << "当前矩形对象数目：";
67     Rect::size_info();    
68     cout << endl;
69 }
70 
71 int main(){
72     test();
73     cout << "当前矩形对象数目：";
74     Rect::size_info();
75     cout << endl;
76 }
View Code

运行测试截图：

实验任务5 源代码： 
 1 #include <iostream>
 2 #include <cmath>
 3 
 4 using namespace std;
 5 class Complex{
 6 private:
 7     double real, imag;
 8 public:
 9     Complex(double real = 0, double imag = 0);
10     Complex(const Complex &c);
11     ~Complex();
12     double get_real() const;
13     double get_imag() const;
14     void show() const;
15     void add(const Complex &c);
16     friend Complex add(const Complex &c1, const Complex &c2);
17     friend bool is_equal(const Complex &c1, const Complex &c2);
18     friend double abs(const Complex &c);
19 };
20 Complex::Complex(double real, double imag): real{real}, imag{imag} {
21 }
22 Complex::Complex(const Complex &c): real{c.real}, imag{c.imag} {
23 }
24 Complex::~Complex() {
25 }
26 double Complex::get_real() const {
27     return real;
28 }
29 double Complex::get_imag() const {
30     return imag;
31 }
32 void Complex::show() const {
33     if(imag > 0)
34     cout << real << "+" << imag << "i" << endl;
35     if(imag < 0)
36     cout << real << imag << "i" << endl;
37     if(imag == 0)
38     cout << real << endl;
39 }
40 void Complex::add(const Complex &c) {
41     real += c.real;
42     imag += c.imag;
43 }
44 Complex add(const Complex &c1, const Complex &c2) {
45     Complex c;
46     c.real = c1.real + c2.real;
47     c.imag = c1.imag + c2.imag;
48     return c;
49 }
50 bool is_equal(const Complex &c1, const Complex &c2) {
51     if(c1.real == c2.real && c1.imag == c2.imag)
52         return true;
53     else
54         return false;
55 }
56 double abs(const Complex &c) {
57     return sqrt(c.real * c.real + c.imag * c.imag);
58 }
59 void test() {
60     using namespace std;
61     Complex c1(3, -4);
62     const Complex c2(4.5);
63     Complex c3(c1);
64 
65     cout << "c1 = ";
66     c1.show();
67     cout << endl;
68 
69     cout << "c2 = ";
70     c2.show();
71     cout << endl;
72     cout << "c2.imag = " << c2.get_imag() << endl;
73 
74     cout << "c3 = ";
75     c3.show();
76     cout << endl;
77 
78     cout << "abs(c1) = ";
79     cout << abs(c1) << endl;
80 
81     cout << boolalpha;
82     cout << "c1 == c3 : " << is_equal(c1, c3) << endl;
83     cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
84 
85     Complex c4;
86     c4 = add(c1, c2);
87     cout << "c4 = c1 + c2 = ";
88     c4.show();
89     cout << endl;
90 
91     c1.add(c2);
92     cout << "c1 += c2, " << "c1 = ";
93     c1.show();
94     cout << endl;
95 }
96 
97 int main() {
98     test();
99 }
View Code

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标签：const,对象,void,float,int,Complex,实验,Rect
From： https://www.cnblogs.com/ZJY1203/p/17775771.html

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