实验2

任务1：

T.h

 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();
View Code

t.cpp

 1 // 类T: 实现
 2 // 普通函数实现
 3 
 4 #include "t.h"
 5 #include <iostream>
 6 #include <string>
 7 
 8 using std::cout;
 9 using std::endl;
10 using std::string;
11 
12 // static成员数据类外初始化
13 const std::string T::doc{"a simple class sample"};
14 const int T::max_cnt = 999;
15 int T::cnt = 0;
16 
17 
18 // 对象方法
19 T::T(int x, int y): m1{x}, m2{y} { 
20     ++cnt; 
21     cout << "T constructor called.\n";
22 } 
23 
24 T::T(const T &t): m1{t.m1}, m2{t.m2} {
25     ++cnt;
26     cout << "T copy constructor called.\n";
27 }
28 
29 T::T(T &&t): m1{t.m1}, m2{t.m2} {
30     ++cnt;
31     cout << "T move constructor called.\n";
32 }    
33 
34 T::~T() {
35     --cnt;
36     cout << "T destructor called.\n";
37 }           
38 
39 void T::adjust(int ratio) {
40     m1 *= ratio;
41     m2 *= ratio;
42 }    
43 
44 void T::display() const {
45     cout << "(" << m1 << ", " << m2 << ")" ;
46 }     
47 
48 // 类方法
49 int T::get_cnt() {
50    return cnt;
51 }
52 
53 // 友元
54 void func() {
55     T t5(42);
56     t5.m2 = 2049;
57     cout << "t5 = "; t5.display(); cout << endl;
58 }
View Code

task1.cpp

 1 #include "t.h"
 2 #include <iostream>
 3 
 4 using std::cout;
 5 using std::endl;
 6 
 7 void test();
 8 
 9 int main() {
10     test();
11     cout << "\nmain: \n";
12     cout << "T objects'current count: " << T::get_cnt() << endl;
13 }
14 
15 void test() {
16     cout << "test class T: \n";
17     cout << "T info: " << T::doc << endl;
18     cout << "T objects'max count: " << T::max_cnt << endl;
19     cout << "T objects'current count: " << T::get_cnt() << endl << endl;
20 
21 
22     T t1;
23     cout << "t1 = "; t1.display(); cout << endl;
24 
25     T t2(3, 4);
26     cout << "t2 = "; t2.display(); cout << endl;
27 
28     T t3(t2);
29     t3.adjust(2);
30     cout << "t3 = "; t3.display(); cout << endl;
31 
32     T t4(std::move(t2));
33     cout << "t3 = "; t4.display(); cout << endl;
34 
35     cout << "T objects'current count: " << T::get_cnt() << endl;
36 
37     func();
38 }
View Code

 运行：

问题1：不能，友元函数没有被声明

问题2：普通构造函数用来初始化对象；复制构造函数用来把一个对象的值赋给另一个对象；移动构造函数把一个对象值给另一个对象，自身值移除；析构函数在对象被删除前调用

问题3：能

任务2：

Complex.h

 1 #include <iostream>
 2 #include <string>
 3 
 4 class Complex{
 5     public:
 6         Complex(double a=0,double b=0);
 7         Complex(const Complex &c);
 8         
 9         add(const Complex &c);
10         ~Complex();
11     private:
12         double real;
13         double imag;
14         
15     public:
16         static const std::string doc;
17         double get_real();
18         double get_imag();
19         friend bool is_equal(const Complex &c1,const Complex &c2);
20         friend bool is_not_equal(const Complex &c1,const Complex &c2);
21         friend Complex add(const Complex &c1,const Complex &c2);
22         friend void output(const Complex &c);
23         friend double abs(const Complex &c);
24         
25 };
View Code

Complex.cpp

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

task2.cpp

 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 }
View Code

 运行：

 

任务3：

task3.cpp

 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 }
View Code

运行：

 

任务4：

Fraction.h

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

Fraction.cpp

 1 #include "Fraction.h"
 2 #include <iostream>
 3 #include <cmath>
 4 
 5 int gcd(int a,int b) {
 6     int r;
 7     while (a%b!=0)
 8     {
 9         r=a%b;
10         a=b;
11         b=r;    
12     }
13     return b; 
14 }
15 
16 using std::cout;
17 using std::endl;
18 
19 const std::string Fraction::doc="Fraction类 v 0.01版.\n目前仅支持分数对象的构造、输出、加/减/乘/除运算.";
20 
21 Fraction::Fraction(int a,int b):up(a),down(b) {}
22 Fraction::Fraction(const Fraction &f){
23     up=f.up;
24     down=f.down;
25 }
26 
27 int Fraction::get_up(){
28     int gg=gcd(abs(up),abs(down));
29     return up/gg;
30 }
31 int Fraction::get_down(){
32     int gg=gcd(abs(up),abs(down));
33     return down/gg;
34 }
35 
36 void output(Fraction f){
37     bool sign=1;
38     if(f.up<0) sign=!sign;
39     if(f.down<0) sign=!sign;
40     if(f.down==0){
41         cout<<"分母不能为0";
42         return;
43     }
44     if(f.up==0){
45         cout<<0;
46         return;
47     }
48     if(f.down==1){
49         cout<<f.up;
50         return;
51     }
52     int t = gcd(abs(f.up),abs(f.down));
53     if(sign)
54         cout<<abs(f.up)/t<<"/"<<abs(f.down)/t;
55     else
56         cout<<"-"<<abs(f.up)/t<<"/"<<abs(f.down)/t;
57     
58 }
59 Fraction add(const Fraction f1,const Fraction f2){
60     Fraction f(0,1);
61     f.down=f1.down*f2.down;
62     f.up=f1.up*f2.down+f2.up*f1.down;
63     return f;
64 }
65 Fraction sub(const Fraction f1,const Fraction f2){
66     Fraction f(0,1);
67     f.down=f1.down*f2.down;
68     f.up=f1.up*f2.down-f2.up*f1.down;
69     return f;
70 }
71 Fraction mul(const Fraction f1,const Fraction f2){
72     Fraction f(0,1);
73     f.up=f1.up*f2.up;
74     f.down=f1.down*f2.down;
75     return f;
76 }
77 Fraction div(const Fraction f1,const Fraction f2){
78     Fraction f(0,1);
79     f.up=f1.up*f2.down;
80     f.down=f1.down*f2.up;
81     return f;
82 }
83 Fraction Fraction::negative(){
84     Fraction f(0,1);
85     f.up=-up;
86     f.down=down;
87     return f;
88 }
89 Fraction::~Fraction(){}
View Code

task4.cpp

 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

 

任务5：

account.h

 1 #include<iostream>
 2 
 3 
 4 class SavingsAccount{
 5     private:
 6         int id;
 7               double balance;
 8         double rate;
 9         int lastDate;
10         double accumulation;
11         static double total;
12 
13         void record(int date,double amount);
14         double accumulate(int date) const{
15             return accumulation+balance*(date-lastDate);
16     }
17 
18 
19     public:
20         SavingsAccount(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         static double getTotal(){return total;}
25         void deposit(int rate,double amount);
26         void withdraw(int rate,double amount);
27         void settle(int date);
28         void show() const;
29         
30         
31 
32 };
View Code

account.cpp

 1 #include "account.h"
 2 #include<cmath>
 3 #include<iostream>
 4 
 5 
 6 using std::cout;
 7 using std::endl;
 8 
 9 double SavingsAccount::total=0;
10 
11 SavingsAccount::SavingsAccount(int date,int id,double rate)
12     :id(id),balance{0},rate{rate},lastDate{date},accumulation{0}{
13     cout<<date<<"\t#"<<id<<"is created"<<endl;
14 }
15 
16 
17 void SavingsAccount::record(int date,double amount){
18     accumulation=accumulate(date);
19     lastDate=date;
20     amount=floor(amount*100+0.5)/100;
21     balance+=amount;
22     total+=amount;
23     cout<<date<<"\t#"<<id<<"\t"<<amount<<"\t"<<balance<<endl;
24 }
25 
26 void SavingsAccount::deposit(int date,double amount){
27     record(date,amount);
28 }
29 
30 
31 void SavingsAccount::withdraw(int date,double amount){
32     if(amount>getBalance()){
33         cout<<"Erroe:not enough money"<<endl;
34     }
35     else{
36         record(date,-amount);
37     }
38 }
39 
40 void SavingsAccount::settle(int date){
41     double interest=accumulate(date)*rate/365;
42     if(interest!=0){
43         record(date,interest);
44     }
45     accumulation=0;
46 }
47 
48 
49 
50 void SavingsAccount::show() const{
51     cout<<"#"<<id<<"\tBalance:"<<balance;
52 }
View Code

task5.cpp

 1 #include "account.h"
 2 #include<iostream>
 3 
 4 using namespace std;
 5 
 6 
 7 
 8 int main(){
 9     SavingsAccount sa0(1,21325302,0.015);
10     SavingsAccount sa1(1,58320212,0.015);
11 
12 
13     sa0.deposit(5,5000);
14     sa1.deposit(25,10000);
15     sa0.deposit(45,5500);
16     sa1.withdraw(60,4000);
17 
18     sa0.settle(90);
19     sa1.settle(90);
20 
21 
22     sa0.show();cout<<endl;
23     sa1.show();cout<<endl;
24 
25     cout<<"Total:"<<SavingsAccount::getTotal()<<endl;
26 
27     return 0;
28 }
View Code

 

 

posted @ 2024-10-26 22:58  打盹  阅读(12)  评论(0)  编辑  收藏  举报