实验二

任务一

代码

  1 #pragma once
  2 
  3 #include <string>
  4 
  5 // 类T: 声明
  6 class T {
  7 // 对象属性、方法
  8 public:
  9     T(int x = 0, int y = 0);   // 普通构造函数
 10     T(const T &t);  // 复制构造函数
 11     T(T &&t);       // 移动构造函数
 12     ~T();           // 析构函数
 13 
 14     void adjust(int ratio);      // 按系数成倍调整数据
 15     void display() const;           // 以(m1, m2)形式显示T类对象信息
 16 
 17 private:
 18     int m1, m2;
 19 
 20 // 类属性、方法
 21 public:
 22     static int get_cnt();          // 显示当前T类对象总数
 23 
 24 public:
 25     static const std::string doc;       // 类T的描述信息
 26     static const int max_cnt;           // 类T对象上限
 27 
 28 private:
 29     static int cnt;         // 当前T类对象数目
 30 
 31 // 类T友元函数声明
 32     friend void func();
 33 };
 34 
 35 // 普通函数声明
 36 void func();
 37 
 38 -------------------------------------------------------------------
 39 
 40 // 类T: 实现
 41 // 普通函数实现
 42 
 43 #include "t.h"
 44 #include <iostream>
 45 #include <string>
 46 
 47 using std::cout;
 48 using std::endl;
 49 using std::string;
 50 
 51 // static成员数据类外初始化
 52 const std::string T::doc{"a simple class sample"};
 53 const int T::max_cnt = 999;
 54 int T::cnt = 0;
 55 
 56 
 57 // 对象方法
 58 T::T(int x, int y): m1{x}, m2{y} { 
 59     ++cnt; 
 60     cout << "T constructor called.\n";
 61 } 
 62 
 63 T::T(const T &t): m1{t.m1}, m2{t.m2} {
 64     ++cnt;
 65     cout << "T copy constructor called.\n";
 66 }
 67 
 68 T::T(T &&t): m1{t.m1}, m2{t.m2} {
 69     ++cnt;
 70     cout << "T move constructor called.\n";
 71 }    
 72 
 73 T::~T() {
 74     --cnt;
 75     cout << "T destructor called.\n";
 76 }           
 77 
 78 void T::adjust(int ratio) {
 79     m1 *= ratio;
 80     m2 *= ratio;
 81 }    
 82 
 83 void T::display() const {
 84     cout << "(" << m1 << ", " << m2 << ")" ;
 85 }     
 86 
 87 // 类方法
 88 int T::get_cnt() {
 89    return cnt;
 90 }
 91 
 92 // 友元
 93 void func() {
 94     T t5(42);
 95     t5.m2 = 2049;
 96     cout << "t5 = "; t5.display(); cout << endl;
 97 }
 98 
 99 ------------------------------------------------------------
100 
101 #include "t.h"
102 #include <iostream>
103 
104 using std::cout;
105 using std::endl;
106 
107 void test();
108 
109 int main() {
110     test();
111     cout << "\nmain: \n";
112     cout << "T objects'current count: " << T::get_cnt() << endl;
113 }
114 
115 void test() {
116     cout << "test class T: \n";
117     cout << "T info: " << T::doc << endl;
118     cout << "T objects'max count: " << T::max_cnt << endl;
119     cout << "T objects'current count: " << T::get_cnt() << endl << endl;
120 
121 
122     T t1;
123     cout << "t1 = "; t1.display(); cout << endl;
124 
125     T t2(3, 4);
126     cout << "t2 = "; t2.display(); cout << endl;
127 
128     T t3(t2);
129     t3.adjust(2);
130     cout << "t3 = "; t3.display(); cout << endl;
131 
132     T t4(std::move(t2));
133     cout << "t3 = "; t4.display(); cout << endl;
134 
135     cout << "T objects'current count: " << T::get_cnt() << endl;
136 
137     func();
138 }
View Code

运行结果

问题一：

去掉line36不可以运行编译

 

问题二：

普通构造函数要在传递指定参数的时候，才会执行，析构函数是这个对象的作用域要结束的时候系统自己调用的。

问题三：

 

任务二

代码



#pragma once
#include<iostream>
#include<string>




using namespace std;




class Complex{
    public:
        Complex(double x = 0,double y = 0);
        Complex(const Complex &c);
        ~Complex();
        
    
    
    private:
        double real;
        double imag;
    
    
    public:
        double get_real() const;
        double get_imag() const;
        void add(const Complex &c);
        
        
    public:
        static const string doc;
    
    friend Complex add(const Complex &c1,const Complex &c2);
    friend bool is_equal(const Complex &c1,const Complex &c2);
    friend bool is_not_equal(const Complex &c1,const Complex &c2);
    friend double abs(const Complex &c);
    friend void output(const Complex &c);
};


 




 




 1 #include "Complex.h"
 2 #include <iostream>
 3 #include <string>
 4 #include<math.h>
 5 #include<cmath>
 6 
 7 using std::cout;
 8 using std::endl;
 9 using std::string;
10 
11 const std::string Complex::doc{"a simplified Complex class"};
12 
13 double Complex::get_real() const{
14     return real;
15 }
16 
17 double Complex::get_imag() const{
18     return imag;
19 }
20 
21 Complex::Complex(double x,double y): real{x}, imag(y) {
22 }
23 
24 Complex::Complex(const Complex &c1): real{c1.get_real()},imag{c1.get_imag()} {
25 }
26 
27 Complex::~Complex(){
28 }
29 
30 void Complex::add(const Complex &c){
31     real += c.get_real();
32     imag += c.get_imag();
33 }
34 
35 Complex add(const Complex &c1,const Complex &c2){
36     return Complex(c1.get_real() + c2.get_real(),c1.get_imag() + c2.get_imag());
37 }
38 
39 bool is_equal(const Complex &c1,const Complex &c2){
40     if(c1.get_real() == c2.get_real() && c1.get_imag() == c2.get_imag()){
41         return true;
42     }
43     return false;
44 }
45 
46 bool is_not_equal(const Complex &c1,const Complex &c2){
47     if(c1.get_real() == c2.get_real() && c1.get_imag() == c2.get_imag()){
48         return false;
49     }
50     return true;
51 }
52 
53 double abs(const Complex &c){
54     return sqrt(c.get_real()*c.get_real() + c.get_imag()*c.get_imag());
55 }
56 
57 void output(const Complex &c){
58     if(c.get_imag() >= 0){
59         cout << c.get_real() << " + " << c.get_imag() << "i" << endl;
60     }else{
61         cout << c.get_real() << " - " << std::abs(c.get_imag()) << "i" << endl;
62     }
63     
64 }






 1 #include "Complex.h"
 2 #include <iostream>
 3 
 4 using std::cout;
 5 using std::endl;
 6 using std::boolalpha;
 7 
 8 void test() {
 9     cout << "类成员测试: " << endl;
10     cout << Complex::doc << endl;
11 
12     cout << endl;
13 
14     cout << "Complex对象测试: " << endl;
15     Complex c1;
16     Complex c2(3, -4);
17     const Complex c3(3.5);
18     Complex c4(c3);
19 
20     cout << "c1 = "; output(c1); cout << endl;
21     cout << "c2 = "; output(c2); cout << endl;
22     cout << "c3 = "; output(c3); cout << endl;
23     cout << "c4 = "; output(c4); cout << endl;
24     cout << "c4.real = " << c4.get_real() << ", c4.imag = " << c4.get_imag() << endl;
25 
26     cout << endl;
27 
28     cout << "复数运算测试: " << endl;
29     cout << "abs(c2) = " << abs(c2) << endl;
30     c1.add(c2);
31     cout << "c1 += c2, c1 = "; output(c1); cout << endl;
32     cout << boolalpha;
33     cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
34     cout << "c1 != c3 : " << is_not_equal(c1, c3) << endl;
35     c4 = add(c2, c3);
36     cout << "c4 = c2 + c3, c4 = "; output(c4); cout << endl;
37 }
38 
39 int main() {
40     test();
41 }




运行结果：




 


任务三


代码




 1 #include <iostream>
 2 #include <complex>
 3 
 4 using std::cout;
 5 using std::endl;
 6 using std::boolalpha;
 7 using std::complex;
 8 
 9 void test() {
10     cout << "标准库模板类comple测试: " << endl;
11     complex<double> c1;
12     complex<double> c2(3, -4);
13     const complex<double> c3(3.5);
14     complex<double> c4(c3);
15 
16     cout << "c1 = " << c1 << endl;
17     cout << "c2 = " << c2 << endl;
18     cout << "c3 = " << c3 << endl;
19     cout << "c4 = " << c4 << endl;
20     cout << "c4.real = " << c4.real() << ", c4.imag = " << c4.imag() << endl;
21     cout << endl;
22 
23     cout << "复数运算测试: " << endl;
24     cout << "abs(c2) = " << abs(c2) << endl;
25     c1 += c2;
26     cout << "c1 += c2, c1 = " << c1 << endl;
27     cout << boolalpha;
28     cout << "c1 == c2 : " << (c1 == c2) << endl;
29     cout << "c1 != c3 : " << (c1 != c3) << endl;
30     c4 = c2 + c3;
31     cout << "c4 = c2 + c3, c4 = " << c4 << endl;
32 }
33 
34 int main() {
35     test();
36 }




结果




 


任务四


代码






 1 #pragma once
 2 #include<iostream>
 3 #include<string>
 4 
 5 using namespace std;
 6 
 7 class Fraction{
 8     public:
 9         Fraction(int x,int y = 1);
10         Fraction(const Fraction &f);
11         ~Fraction();
12         int get_up() const;
13         int get_down() const;
14         Fraction negative();
15     
16     private:
17         int up;
18         int down;
19         
20     public:
21         static const string doc;
22         friend void output(const Fraction &f);
23         friend Fraction add(const Fraction &f1,const Fraction &f2);
24         friend Fraction sub(const Fraction &f1,const Fraction &f2);
25         friend Fraction mul(const Fraction &f1,const Fraction &f2);
26         friend Fraction div(const Fraction &f1,const Fraction &f2);
27     
28 }; 



View Code






  1 #include "Fraction.h"
  2 #include <iostream>
  3 #include <string>
  4 #include<math.h>
  5 #include<cmath>
  6   
  7   using std::cout;
  8   using std::endl;
  9   using std::string;
 10   
 11   const std::string Fraction::doc = "Fraction类基础功能测试";
 12   
 13   Fraction::Fraction(int x,int y){
 14       int a = abs(x),b = y;
 15       while (b != 0) {
 16             int temp = b;
 17             b = a % b;
 18             a = temp;
 19         }
 20     up = x / a;
 21     down = y / a;
 22   } 
 23   
 24   Fraction::Fraction(const Fraction &f): up{f.get_up()},down{f.get_down()}{
 25   }
 26   
 27   Fraction::~Fraction(){
 28   }
 29   
 30   int Fraction::get_up() const{
 31       return up;
 32   }
 33   
 34   int Fraction::get_down() const{
 35       return down;
 36   }
 37   
 38   Fraction Fraction::negative(){
 39       return Fraction((-1)*up,down);
 40   }
 41   
 42   void output(const Fraction &f){
 43       if(f.get_down() == 0){
 44           cout << "分母不能为零";
 45           return; 
 46       }
 47       if(f.get_down() == 1){
 48           cout << f.get_up();
 49       }else{
 50           cout << f.get_up() << "/" << f.get_down();
 51       }
 52   }
 53   
 54   Fraction add(const Fraction &f1,const Fraction &f2){
 55       int gcd = f1.get_down();
 56     int temp_b = f2.get_down();
 57 
 58     while (temp_b != 0) {
 59         int temp = temp_b;
 60         temp_b = gcd % temp_b;
 61         gcd = temp;
 62     }
 63     
 64     int minMax = std::abs(f1.get_down()*f2.get_down()) / gcd;
 65     
 66     int i = minMax/f1.get_down();
 67     int j = minMax/f2.get_down();
 68   
 69   return Fraction(i*f1.get_up() + j*f2.get_up(),minMax);
 70   }
 71 
 72   
 73   
 74   
 75   Fraction sub(const Fraction &f1,const Fraction &f2){
 76       int gcd = f1.get_down();
 77     int temp_b = f2.get_down();
 78 
 79     while (temp_b != 0) {
 80         int temp = temp_b;
 81         temp_b = gcd % temp_b;
 82         gcd = temp;
 83     }
 84     
 85     int minMax = std::abs(f1.get_down()*f2.get_down()) / gcd;
 86       int i,j;
 87   
 88   i = minMax/f1.get_down();
 89   j = minMax/f2.get_down();
 90   
 91   return Fraction(i*f1.get_up() - j*f2.get_up(),minMax);
 92   }
 93   
 94 
 95   
 96   
 97   Fraction mul(const Fraction &f1,const Fraction &f2){
 98       return Fraction(f1.get_up()*f2.get_up(),f1.get_down()*f2.get_down());
 99   }
100   
101   Fraction div(const Fraction &f1,const Fraction &f2){
102       return Fraction(f1.get_up()*f2.get_down(),f1.get_down()*f2.get_up());
103   }



View Code






 1 #include "Fraction.h"
 2 #include <iostream>
 3 
 4 using std::cout;
 5 using std::endl;
 6 
 7 
 8 void test1() {
 9     cout << "Fraction类测试: " << endl;
10     cout << Fraction::doc << endl << endl;
11 
12     Fraction f1(5);
13     Fraction f2(3, -4), f3(-18, 12);
14     Fraction f4(f3);
15     cout << "f1 = "; output(f1); cout << endl;
16     cout << "f2 = "; output(f2); cout << endl;
17     cout << "f3 = "; output(f3); cout << endl;
18     cout << "f4 = "; output(f4); cout << endl;
19 
20     Fraction f5(f4.negative());
21     cout << "f5 = "; output(f5); cout << endl;
22     cout << "f5.get_up() = " << f5.get_up() << ", f5.get_down() = " << f5.get_down() << endl;
23 
24     cout << "f1 + f2 = "; output(add(f1, f2)); cout << endl;
25     cout << "f1 - f2 = "; output(sub(f1, f2)); cout << endl;
26     cout << "f1 * f2 = "; output(mul(f1, f2)); cout << endl;
27     cout << "f1 / f2 = "; output(div(f1, f2)); cout << endl;
28     cout << "f4 + f5 = "; output(add(f4, f5)); cout << endl;
29 }
30 
31 void test2() {
32     Fraction f6(42, 55), f7(0, 3);
33     cout << "f6 = "; output(f6); cout << endl;
34     cout << "f7 = "; output(f7); cout << endl;
35     cout << "f6 / f7 = "; output(div(f6, f7)); cout << endl;
36 }
37 
38 int main() {
39     cout << "测试1: Fraction类基础功能测试\n";
40     test1();
41 
42     cout << "\n测试2: 分母为0测试: \n";
43     test2();
44 }



View Code


运行结果




 


任务五


代码






 1 #ifndef __ACCOUNT_H__
 2 #define __ACCOUNT_H__
 3 
 4 class SavingAccount {
 5 private:
 6     int id;
 7     double balance;
 8     double rate;
 9     int lastDate;
10     double accumulation;
11 
12     static double total;
13 
14     void record(int data, double amount);
15     double accumulate(int date) const {
16         return accumulation + balance * (date - lastDate);
17     }
18 
19 public:
20     SavingAccount(int date, int id, double rate);
21     int getId() const { return id; }
22     double getBalance() const { return balance; }
23     double getRate() const { return rate; }
24 
25     static double getTotal() { return total; }
26 
27     void deposit(int date, double amount);
28     void withdraw(int date, double amount);
29 
30     void settle(int date);
31 
32     void show() const;
33 };



View Code






 1 #include "5.h"
 2 #include <cmath>
 3 #include <iostream>
 4 using namespace std;
 5 
 6 double SavingAccount::total = 0;
 7 
 8 SavingAccount::SavingAccount(int date, int id, double rate)
 9     : id{ id }, balance{ 0 }, rate{ rate }, lastDate{ date }, accumulation{ 0 } {
10     cout << date << "\t#" << id << "is created" << endl;
11 }
12 
13 void SavingAccount::record(int date, double amount) {
14     accumulation = accumulate(date);
15     lastDate = date;
16     amount = floor(amount * 100 + 0.5) / 100;
17     balance += amount;
18     total += amount;
19     cout << date << "\t#" << id << "\t" << amount << "\t" << balance << endl;
20 }
21 
22 void SavingAccount::deposit(int date, double amount) {
23     record(date, amount);
24 }
25 
26 void SavingAccount::withdraw(int date, double amount) {
27     if (amount > getBalance())
28         cout << "Error: not enough money" << endl;
29     else
30         record(date, -amount);
31 }
32 
33 void SavingAccount::settle(int date) {
34     double interest = accumulate(date) * rate / 365;
35     if (interest != 0)
36         record(date, interest);
37     accumulation = 0;
38 }
39 
40 void SavingAccount::show() const {
41     cout << "#" << id << "\tBalance: " << balance;
42 }



View Code






 1 #include "5.h"
 2 #include <iostream>
 3 using namespace std;
 4 
 5 int main() {
 6     SavingAccount sa0(1, 21325302, 0.015);
 7     SavingAccount sa1(1, 58320212, 0.015);
 8 
 9     sa0.deposit(5, 5000);
10     sa1.deposit(25, 10000);
11     sa0.deposit(45, 5500);
12     sa1.deposit(60, 4000);
13 
14     sa0.settle(90);
15     sa1.settle(90);
16 
17     sa0.show(); cout << endl;
18     sa1.show(); cout << endl;
19     cout << "Total: " << SavingAccount::getTotal() << endl;
20 }



View Code


运行结果




 






            

            
posted @ 
2024-10-27 21:49 
枯基Evan 
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