任务1
代码：
t.h:
1 #pragma once
2 #include<string>
3
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 adjust(int ratio);
11 void display()const;
12 private:
13 int m1, m2;
14
15 public:
16 static int get_cnt();
17
18 public:
19 static const std::string doc;
20 static const int max_cnt;
21
22 private:
23 static int cnt;
24 friend void func();
25 };
26
27 void func();
View Code
t.cpp:
// 类T: 实现
// 普通函数实现
#include "t.h"
#include <iostream>
#include <string>
using std::cout;
using std::endl;
using std::string;
// static成员数据类外初始化
const std::string T::doc{"a simple class sample"};
const int T::max_cnt = 999;
int T::cnt = 0;
// 对象方法
T::T(int x, int y): m1{x}, m2{y} {
++cnt;
cout << "T constructor called.\n";
}
T::T(const T &t): m1{t.m1}, m2{t.m2} {
++cnt;
cout << "T copy constructor called.\n";
}
T::T(T &&t): m1{t.m1}, m2{t.m2} {
++cnt;
cout << "T move constructor called.\n";
}
T::~T() {
--cnt;
cout << "T destructor called.\n";
}
void T::adjust(int ratio) {
m1 *= ratio;
m2 *= ratio;
}
void T::display() const {
cout << "(" << m1 << ", " << m2 << ")" ;
}
// 类方法
int T::get_cnt() {
return cnt;
}
// 友元
void func() {
T t5(42);
t5.m2 = 2049;
cout << "t5 = "; t5.display(); cout << endl;
}
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
运行截图：
问题1：不能， 原因可能是没有声明函数。
问题2：普通构造函数实现了对类的初始化，复制构造函数主要用于初始化一个新的对象，使其成为另一个同类型对象的副本，它会将引用的源对象的值复制到新对象中。移动构造函数的作用是提高程序的效率，其通过右值引用创建新对象，它避免了深拷贝，直接转移原始对象的资源到新对象中，从而减少了复制的时间。析构函数作用是在对象生命周期结束时进行资源清理。当前三种构造函数全部结束时析构函数会自动调用多遍。
问题3：不能正确编译。
任务2
代码：
Complex.h:
1 class Complex{
2
3 public:
4 static string doc;
5 Complex(double r=0,double i=0);
6 Complex(const Complex &c);
7 double get_real();
8 double get_imag();
9 void add(Complex &c);
10 friend Complex add(const Complex &c1,const Complex &c2);
11 friend bool is_equal(const Complex &c1,const Complex &c2);
12 friend bool is_not_equal(const Complex &c1,const Complex &c2);
13 friend void output(const Complex &c1);
14 friend double abs(const Complex &c1);
15 private:
16 double real;
17 double imag;
18
19 };
20
21 #endif
View Code
Complex.cpp:
1 #include <bits/stdc++.h>
2 #include "Complex.h"
3 using namespace std;
4
5 string Complex::doc="a simplified complex class";
6 Complex::Complex(double r,double i):real{r},imag{i}{}
7 Complex::Complex(const Complex &c):real{c.real},imag{c.imag}{}
8 double Complex::get_real(){return real;}
9 double Complex::get_imag(){return imag;}
10 void Complex::add(Complex &c){
11 real+=c.real;
12 imag+=c.imag;
13 }
14 Complex add(const Complex &c1,const Complex &c2)
15 {
16 Complex c3;
17 c3.real=c1.real+c2.real;
18 c3.imag=c1.imag+c2.imag;
19 return c3;
20 }
21
22 bool is_equal(const Complex &c1,const Complex &c2)
23 {
24 if(c1.real==c2.real&&c1.imag==c2.imag)
25 return true;
26 return false;
27 }
28
29 bool is_not_equal(const Complex &c1,const Complex &c2)
30 {
31 if(c1.real==c2.real&&c1.imag==c2.imag)
32 return false;
33 return true;
34 }
35
36 void output(const Complex &c1)
37 {
38 cout<<c1.real<<" + "<<c1.imag<<"i"<<endl;
39 }
40
41 double abs(const Complex &c1)
42 {
43 return sqrt(c1.real*c1.real+c1.imag*c1.imag);
44 }
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
运行截图：
任务3
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 }
View Code
运行截图：
任务4
代码：
Fraction.h:
1 #pragma once
2 #include<string>
3
4 class Fraction{
5 private:
6 int up;
7 int down;
8
9 public:
10 Fraction(int u,int d=1);
11 Fraction(const Fraction &f);
12
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 void output(const Fraction f);
24 Fraction add(const Fraction f1,const Fraction f2);
25 Fraction sub(const Fraction f1,const Fraction f2);
26 Fraction mul(const Fraction f1,const Fraction f2);
27 Fraction div(const Fraction f1,const Fraction f2);
View Code
Fraction.cpp:
1 #include <bits/stdc++.h>
2 #include "Fraction.h"
3 using namespace std;
4
5 const 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.\n";
6 Fraction::Fraction(int u,int d):up{u},down{d}{}
7 Fraction::Fraction(const Fraction &f):up{f.up},down{f.down}{}
8 int Fraction::get_up()
9 {
10 int a,b;
11 a=abs(up);b=abs(down);
12
13 while (b)
14 {
15 int tmp=a;
16 a=b;
17 b=tmp%b;
18 }
19 return up/a;
20 }
21 int Fraction::get_down()
22 {
23 int a,b;
24 a=abs(up);b=abs(down);
25
26 while (b)
27 {
28 int tmp=a;
29 a=b;
30 b=tmp%b;
31 }
32 return down/a;
33 }
34 Fraction Fraction::negative()
35 {
36 int new_up=-up;
37 Fraction f(new_up,down);
38 return f;
39 }
40
41 void output(const Fraction f)
42 {
43 if (f.down==0)
44 {
45 cout<<"分母不能为0";
46 return ;
47 }
48
49 int a,b;
50 a=abs(f.up);b=abs(f.down);
51
52 while (b)
53 {
54 int tmp=a;
55 a=b;
56 b=tmp%b;
57 }
58 int new_down=f.down/a;
59 if (new_down==1)
60 cout<<f.up/a;
61 else if (f.up*f.down>0)
62 cout<<abs(f.up)/a<<"/"<<abs(f.down)/a;
63 else
64 cout<<"-"<<abs(f.up)/a<<"/"<<abs(f.down)/a;
65 }
66
67 Fraction add(const Fraction f1,const Fraction f2)
68 {
69 int new_down=f1.down*f2.down;
70 int new_up=f1.up*f2.down+f2.up*f1.down;
71 int a,b;
72 a=abs(new_up);b=abs(new_down);
73 while (b)
74 {
75 int tmp=a;
76 a=b;
77 b=tmp%b;
78 }
79 new_up/=a;new_down/=a;
80 Fraction f(new_up,new_down);
81 return f;
82 }
83
84 Fraction sub(Fraction f1,Fraction f2)
85 {
86 int new_down=f1.down*f2.down;
87 int new_up=f1.up*f2.down-f2.up*f1.down;
88 int a,b;
89 a=abs(new_up);b=abs(new_down);
90 while (b)
91 {
92 int tmp=a;
93 a=b;
94 b=tmp%b;
95 }
96 new_up/=a;new_down/=a;
97 Fraction f(new_up,new_down);
98 return f;
99 }
100
101 Fraction mul(Fraction f1,Fraction f2)
102 {
103 int new_up=f1.up*f2.up;
104 int new_down=f1.down*f2.down;
105 int a,b;
106 a=abs(new_up);b=abs(new_down);
107 while (b)
108 {
109 int tmp=a;
110 a=b;
111 b=tmp%b;
112 }
113 new_up/=a;new_down/=a;
114 Fraction f(new_up,new_down);
115 return f;
116 }
117
118 Fraction div(Fraction f1,Fraction f2)
119 {
120
121 int new_up=f1.up*f2.down;
122 int new_down=f1.down*f2.up;
123 int a,b;
124 a=abs(new_up);b=abs(new_down);
125 while (b)
126 {
127 int tmp=a;
128 a=b;
129 b=tmp%b;
130 }
131 new_up/=a;new_down/=a;
132 Fraction f(new_up,new_down);
133 return f;
134 }
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
运行截图：
任务5
代码：
account.h:
1 #ifndef __ACCOUNT_H__
2 #define __ACCOUNT_H__
3
4 class SavingAccount{
5 private:
6 int id;
7 double balance;
8 double rate;
9 double lastData;
10 double accumulation;
11
12 static double total;
13
14 void record(int data,double amount);
15 double accumulate(int data) const
16 {
17 return accumulation+balance*(data-lastData);
18 }
19 public:
20 SavingAccount(int data,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 data,double amount);
26 void withdraw(int data,double amount);
27 void settle(int data);
28 void show() const;
29 };
30 #endif
View Code
account.cpp:
1 #include <bits/stdc++.h>
2 #include "account.h"
3 using namespace std;
4
5 double SavingAccount::total=0;
6 SavingAccount::SavingAccount(int data,int id,double rate)
7 :id(id),balance(0),rate(rate),lastData(data),accumulation(0)
8 {
9 cout<<data<<"\t#"<<id<<"is created"<<endl;
10 }
11
12 void SavingAccount::record(int data,double amount)
13 {
14 accumulation=accumulate(data);
15 lastData=data;
16 amount=floor(amount*100+0.5)/100;
17 balance+=amount;
18 total+=amount;
19 cout<<data<<"\t#"<<id<<"\t"<<amount<<"\t"<<balance<<endl;
20 }
21
22 void SavingAccount::deposit(int data,double amount)
23 {
24 record(data,amount);
25 }
26
27 void SavingAccount::withdraw(int data,double amount)
28 {
29 if (amount>getBalance())
30 cout<<"Error:not enough money"<<endl;
31 else
32 record(data,-amount);
33 }
34
35 void SavingAccount::settle(int data)
36 {
37 double interest=accumulate(data)*rate/365;
38 if (interest!=0)
39 record(data,interest);
40 accumulation=0;
41 }
42 void SavingAccount::show() const
43 {
44 cout<<"#"<<id<<"\tBalance:"<<balance;
45 }
View Code
5_11.cpp:
1 #include "account.h"
2 #include <iostream>
3 using namespace std;
4
5 int main ()
6 {
7 SavingAccount sa0(1,21325302,0.015);
8 SavingAccount sa1(1,58320212,0.015);
9
10 sa0.deposit(5,5000);
11 sa1.deposit(25,10000);
12 sa0.deposit(45,5500);
13 sa1.deposit(60,4000);
14
15 sa0.settle(90);
16 sa1.settle(90);
17
18 sa0.show();cout<<endl;
19 sa1.show();cout<<endl;
20 cout<<"Total:"<<SavingAccount::getTotal()<<endl;
21 return 0;
22 }
View Code
运行截图：
好难
标签：const,对象,double,int,Complex,实验,Fraction,include From： https://www.cnblogs.com/dianchufa/p/18514280