实验任务1：
源码及截图：
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
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 }
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:
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 }
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();
问题1：
类外的普通函数没有声明导致报错
问题2：
普通构造函数：通过读入的数值构造一个类
复制构造函数：将一个类的信息复制到另一个类里
移动构造函数：将一个类的信息移动到另一个类里，并释放原类的内存空间
问题3：
不能通过编译
实验任务2：
源码及截图：
1 #pragma once
2 #include<string>
3 class Complex{
4 private:
5 double real;
6 double imag;
7 public:
8 static const std::string doc;
9 Complex(double r=0,double i=0);
10 Complex(const Complex &c);
11 double get_real()const;
12 double get_imag()const;
13 void add(const Complex &c);
14 friend Complex add(const Complex &c1,const Complex &c2);
15 friend bool is_equal(const Complex &c1,const Complex &c2);
16 friend bool is_not_equal(const Complex &c1,const Complex &c2);
17 friend double abs(const Complex &c);
18 friend void output(const Complex &c);
19 };
20 Complex add(const Complex &c1,const Complex &c2);
21 bool is_equal(const Complex &c1,const Complex &c2);
22 bool is_not_equal(const Complex &c1,const Complex &c2);
23 double abs(const Complex &c);
24 void output(const Complex &c);
1 #include"Complex.h"
2 #include<iostream>
3 #include<string>
4 #include<math.h>
5 using std::cout;
6 using std::endl;
7 using std::string;
8 const std::string Complex::doc{"a simplified Complex class"};
9
10 Complex::Complex(double r,double i):real{r},imag{i}{
11 }
12 Complex::Complex(const Complex &c):real{c.real},imag{c.imag}{
13 }
14 double Complex::get_real()const{
15 return real;
16 }
17 double Complex::get_imag()const{
18 return imag;
19 }
20 void Complex::add(const Complex &c){
21 real+=c.real;
22 imag+=c.imag;
23
24 }
25 Complex add(const Complex &c1,const Complex &c2){
26 return Complex(c1.real+c2.real,c1.imag+c2.imag);
27 }
28 bool is_equal(const Complex &c1,const Complex &c2){
29 if(c1.real==c2.real&&c1.imag==c2.imag){
30 return true;
31 }
32 else
33 return false;
34 }
35 bool is_not_equal(const Complex &c1,const Complex &c2){
36 if(c1.real==c2.real&&c1.imag==c2.imag){
37 return false;
38 }
39 else
40 return true;
41 }
42 void output(const Complex &c){
43 if(c.imag>=0){
44 cout<<c.real<<"+"<<c.imag<<"i"<<endl;
45 }
46 else
47 cout<<c.real<<c.imag<<"i"<<endl;
48 }
49 double abs(const Complex &c){
50 double t;
51 t=sqrt(pow(c.real,2)+pow(c.imag,2));
52 return t;
53 }
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 }
实验任务3：
源码及截图：
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 }
实验任务4：
源码及截图：
1 #include<iostream>
2 #include<string>
3 #include<math.h>
4 using namespace std;
5 class Fraction{
6 public:
7 static const std::string doc;
8 Fraction(int r,int i=1){
9 up=r;
10 down=i;
11 if(down<0){
12 up=-1*up;
13 down=-1*down;
14 }
15 }
16 Fraction(const Fraction &c){
17 up=c.up;
18 down=c.down;
19 }
20 int get_up(){
21 return up;
22 }
23 int get_down(){
24 return down;
25 }
26 Fraction negative(){
27 return Fraction(-1*up,down);
28 }
29 friend void output(const Fraction &c);
30
31 friend Fraction add(const Fraction &f1,const Fraction &f2);
32
33 friend Fraction sub(const Fraction &f1,const Fraction &f2);
34
35 friend Fraction mul(const Fraction &f1,const Fraction &f2);
36
37 friend Fraction div(const Fraction &f1,const Fraction &f2);
38
39 private:
40 int up;
41 int down;
42
43 };
44 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."};
45 void output(const Fraction &c){
46 int i,n,m;
47 if(c.down==0){
48 cout<<"分母不能为0";
49 }
50 else if(c.up==0){
51 cout<<0;
52 }
53
54 else if(c.down==1){
55 cout<<c.up<<endl;
56 }
57 else{
58
59 for(i=2;i<=abs(c.up)&&i<=c.down;i++){
60 if(abs(c.up)%i==0&&c.down%i==0){
61 n=c.up/i;
62 m=c.down/i;
63 }
64 }
65 if(i<abs(c.up))
66 cout<<n<<"/"<<m;
67 else
68 cout<<c.up<<"/"<<c.down;
69 }
70 }
71 Fraction add(const Fraction &f1,const Fraction &f2){
72 return Fraction(f1.up*f2.down+f2.up*f1.down,f1.down*f2.down);
73 }
74 Fraction sub(const Fraction &f1,const Fraction &f2){
75 return Fraction(f1.up*f2.down-f2.up*f1.down,f1.down*f2.down);
76 }
77 Fraction mul(const Fraction &f1,const Fraction &f2){
78 return Fraction(f1.up*f2.up,f1.down*f2.down);
79 }
80 Fraction div(const Fraction &f1,const Fraction &f2){
81 return Fraction(f1.up*f2.down,f1.down*f2.up);
82 }
83
84
85 void test1() {
86 cout << "Fraction类测试: " << endl;
87 cout << Fraction::doc << endl << endl;
88
89 Fraction f1(5);
90 Fraction f2(3, -4), f3(-18, 12);
91 Fraction f4(f3);
92 cout << "f1 = "; output(f1); cout << endl;
93 cout << "f2 = "; output(f2); cout << endl;
94 cout << "f3 = "; output(f3); cout << endl;
95 cout << "f4 = "; output(f4); cout << endl;
96
97 Fraction f5(f4.negative());
98 cout << "f5 = "; output(f5); cout << endl;
99 cout << "f5.get_up() = " << f5.get_up() << ", f5.get_down() = " << f5.get_down() << endl;
100
101 cout << "f1 + f2 = "; output(add(f1, f2)); cout << endl;
102 cout << "f1 - f2 = "; output(sub(f1, f2)); cout << endl;
103 cout << "f1 * f2 = "; output(mul(f1, f2)); cout << endl;
104 cout << "f1 / f2 = "; output(div(f1, f2)); cout << endl;
105 cout << "f4 + f5 = "; output(add(f4, f5)); cout << endl;
106 }
107
108 void test2() {
109 Fraction f6(42, 55), f7(0, 3);
110 cout << "f6 = "; output(f6); cout << endl;
111 cout << "f7 = "; output(f7); cout << endl;
112 cout << "f6 / f7 = "; output(div(f6, f7)); cout << endl;
113 }
114
115 int main() {
116 cout << "测试1: Fraction类基础功能测试\n";
117 test1();
118
119 cout << "\n测试2: 分母为0测试: \n";
120 test2();
121 }
实验任务5：
源码及截图：
1 #include<cmath>
2 #include<iostream>
3
4 using namespace std;
5 #ifndef _ACCOUNT_H_
6
7 #define _ACCOUNT_H_
8
9 class SavingsAccount //储蓄账户类
10
11 {
12
13 private:
14
15 int id; //账号
16
17 double balance; //余额
18
19 double rate; //存款的年利率
20
21 int lastDate; //上次变更余额的日期
22
23 double accumulation; //余额按日累加之和
24
25 static double total; //所有账户的总金额
26
27 //记录一笔账，date为日期，desc为说明
28
29 void record(int date, double amount);
30
31 //获得到指定日期为止的存款金额按日累积值
32
33 double accumulate(int date) const
34
35 {
36
37 return accumulation + balance*(date - lastDate);
38
39 }
40
41 public:
42
43 //构造函数
44
45 SavingsAccount(int date, int id, double rate);
46
47 int getId() const { return id; }
48
49 double getBalance() const { return balance; }
50
51 double getRate() const { return rate; }
52
53 static double getTotal() { return total; }
54
55 void deposit(int date, double amount); //存入现金
56
57 void withdraw(int date, double amount); //取出现金
58
59 //结算利息，每年1月1日调用一次该函数
60
61 void settle(int date);
62
63 //显示账户信息
64
65 void show() const;
66
67 };
68
69 #endif//_ACCOUNT_H_
70
71
72
73
74
75
76 using namespace std;
77
78 double SavingsAccount::total = 0;
79
80 //SavingsAccount类相关成员函数的实现
81
82 SavingsAccount::SavingsAccount(int date, int id, double rate)
83
84 : id(id), balance(0), rate(rate), lastDate(date), accumulation(0)
85
86 {
87
88 cout << date << "\t#" << id << " is created" << endl;
89
90 }
91
92 void SavingsAccount::record(int date, double amount)
93
94 {
95
96 accumulation = accumulate(date);
97
98 lastDate = date;
99
100 amount = floor(amount * 100 + 0.5) / 100; //保留小数点后两位
101
102 balance += amount;
103
104 total += amount;
105
106 cout << date << "\t#" << id << "\t" << amount << "\t" << balance << endl;
107
108 }
109
110 void SavingsAccount::deposit(int date, double amount)
111
112 {
113
114 record(date, amount);
115
116 }
117
118 void SavingsAccount::withdraw(int date, double amount)
119
120 {
121
122 if (amount>getBalance())
123
124 cout << "Error:not enough money" << endl;
125
126 else
127
128 record(date, -amount);
129
130 }
131
132 void SavingsAccount::settle(int date)
133
134 {
135
136 double interest = accumulate(date)*rate / 365; //计算年息
137
138 if (interest != 0)
139
140 record(date, interest);
141
142 accumulation = 0;
143
144 }
145
146 void SavingsAccount::show() const
147
148 {
149
150 cout << "#" << id << "\tBalance:" << balance;
151
152 }
153 int main()
154
155 {
156
157 //建立几个账户
158
159 SavingsAccount sa0(1, 21325302, 0.015);
160
161 SavingsAccount sa1(1, 58320212, 0.015);
162
163 //几笔账目
164
165 sa0.deposit(5, 5000);
166
167 sa1.deposit(25, 10000);
168
169 sa0.deposit(45, 5500);
170
171 sa1.withdraw(60, 4000);
172
173 //开户后第90天到了银行的计息日，结算所有账户的年息
174
175 sa0.settle(90);
176
177 sa1.settle(90);
178
179 //输出各个账户信息
180
181 sa0.show(); cout << endl;
182
183 sa1.show(); cout << endl;
184
185 cout << "Total:" << SavingsAccount::getTotal() << endl;
186
187 return 0;
188
189 }
标签：std,const,int,double,Complex,实验,include From： https://www.cnblogs.com/zyf-666/p/18497816