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
标签：std,const,int,Complex,实验,Fraction,include From： https://www.cnblogs.com/snoozy/p/18494454