1，实验任务1
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 }
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();
task.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 }
问题一:重新编译后不能正确运行
原因是task1.cpp中的test函数以及main函数中调用了func函数，如果类外部不声明func函数，编译器无法识别该函数的定义位置
普通构造函数：T（int x=0,int y=0）
2.实验任务2
Complex.h
1 #pragma once
2 #include <string>
3
4 class Complex {
5 public:
6 static const std::string doc;
7 Complex(double r = 0, double i = 0);
8 Complex(const Complex& c);
9 double get_real() const;
10 double get_imag() const;
11 Complex add(const Complex& c) const;
12 friend Complex add(const Complex& c1, const Complex& c2);
13 friend bool is_equal(const Complex& c1, const Complex& c2);
14 friend bool is_not_equal(const Complex& c1, const Complex& c2);
15 friend double abs(const Complex& c);
16 friend void output(const Complex& c);
17 private:
18 double real;
19 double imag;
20 };
Complex.cpp
1 #include "Complex.h"
2 #include <iostream>
3 #include <cmath>
4
5 const std::string Complex::doc = "a simplified complex class";
6
7 Complex::Complex(double r, double i) : real{r}, imag{i} {}
8 Complex::Complex(const Complex& c) : real{c.real}, imag{c.imag} {}
9 double Complex::get_real() const { return real; }
10 double Complex::get_imag() const { return imag; }
11 Complex Complex::add(const Complex& c) const {
12 return Complex(real + c.real, imag + c.imag);
13 }
14 Complex add(const Complex& c1, const Complex& c2) {
15 return Complex(c1.real + c2.real, c1.imag + c2.imag);
16 }
17 bool is_equal(const Complex& c1, const Complex& c2) {
18 return c1.real == c2.real && c1.imag == c2.imag;
19 }
20 bool is_not_equal(const Complex& c1, const Complex& c2) {
21 return!(c1.real == c2.real && c1.imag == c2.imag);
22 }
23 double abs(const Complex& c) {
24 return std::sqrt(c.real * c.real + c.imag * c.imag);
25 }
26 void output(const Complex& c) {
27 std::cout << c.real;
28 if (c.imag >= 0) std::cout << "+";
29 std::cout << c.imag << "i";
30 }
task2.cpp
1 #include <iostream>
2 #include "Complex.h"
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
构造函数：使用了带参数的构造函数来创建对象
访问实部和虚部的接口：c4.real()和c4.imag()用于获取复数对象的实部和虚部
加法运算接口 自加运算接口 相等判断接口 取模运算接口
对比任务2 代码写法不同更加简洁
实验任务4
Fraction.h
1 #pragma once
2 #include <string>
3
4 class Fraction {
5 public:
6 // 类的描述信息
7 static const std::string doc;
8 // 构造函数
9 Fraction(int up = 0, int down = 1);
10 Fraction(const Fraction& f);
11 // 接口函数
12 int get_up() const;
13 int get_down() const;
14 Fraction negative() const;
15 // 友元函数声明
16 friend void output(const Fraction& f);
17 friend Fraction add(const Fraction& f1, const Fraction& f2);
18 friend Fraction sub(const Fraction& f1, const Fraction& f2);
19 friend Fraction mul(const Fraction& f1, const Fraction& f2);
20 friend Fraction div(const Fraction& f1, const Fraction& f2);
21 private:
22 int up;
23 int down;
24 };
Fraction.cpp
#include "Fraction.h"
#include <iostream>
using std::cout;
using std::endl;
void test1() {
cout << "Fraction类测试: " << endl;
cout << Fraction::doc << endl << endl;
Fraction f1(5);
Fraction f2(3, -4), f3(-18, 12);
Fraction f4(f3);
cout << "f1 = "; output(f1); cout << endl;
cout << "f2 = "; output(f2); cout << endl;
cout << "f3 = "; output(f3); cout << endl;
cout << "f4 = "; output(f4); cout << endl;
Fraction f5(f4.negative());
cout << "f5 = "; output(f5); cout << endl;
cout << "f5.get_up() = " << f5.get_up() << ", f5.get_down() = " <<
f5.get_down() << endl;
cout << "f1 + f2 = "; output(add(f1, f2)); cout << endl;
cout << "f1 - f2 = "; output(sub(f1, f2)); cout << endl;
cout << "f1 * f2 = "; output(mul(f1, f2)); cout << endl;
cout << "f1 / f2 = "; output(div(f1, f2)); cout << endl;
cout << "f4 + f5 = "; output(add(f4, f5)); cout << endl;
}
void test2() {
Fraction f6(42, 55), f7(0, 3);
cout << "f6 = "; output(f6); cout << endl;
cout << "f7 = "; output(f7); cout << endl;
cout << "f6 / f7 = "; output(div(f6, f7)); cout << endl;
}
int main() {
cout << "测试1: Fraction类基础功能测试\n";
test1();
cout << "\n测试2: 分母为0测试: \n";
test2();
return 0;
}
实验任务5
account.h
1 #include<iostream>
2
3 class SavingsAccount{
4 private:
5 int id;
6 double balance;
7 double rate;
8 int lastDate;
9 double accumulation;
10 static double total;
11
12 void record(int date,double amount);
13 double accumulate(int date) const{
14 return accumulation+balance*(date-lastDate);
15 }
16
17 public:
18 SavingsAccount(int date,int id,double rate);
19 int getId() const {return id;}
20 double getBalance() const{return balance;}
21 double getRate() const{return rate;}
22 static double getTotal(){return total;}
23 void deposit(int rate,double amount);
24 void withdraw(int rate,double amount);
25 void settle(int date);
26 void show() const;
27
28 };
account.cpp
#include "account.h"
#include<cmath>
#include<iostream>
using std::cout;
using std::endl;
double SavingsAccount::total=0;
SavingsAccount::SavingsAccount(int date,int id,double rate)
:id(id),balance{0},rate{rate},lastDate{date},accumulation{0}{
cout<<date<<"\t#"<<id<<"is created"<<endl;
}
void SavingsAccount::record(int date,double amount){
accumulation=accumulate(date);
lastDate=date;
amount=floor(amount*100+0.5)/100;
balance+=amount;
total+=amount;
cout<<date<<"\t#"<<id<<"\t"<<amount<<"\t"<<balance<<endl;
}
void SavingsAccount::deposit(int date,double amount){
record(date,amount);
}
void SavingsAccount::withdraw(int date,double amount){
if(amount>getBalance()){
cout<<"Erroe:not enough money"<<endl;
}
else{
record(date,-amount);
}
}
void SavingsAccount::settle(int date){
double interest=accumulate(date)*rate/365;
if(interest!=0){
record(date,interest);
}
accumulation=0;
}
void SavingsAccount::show() const{
cout<<"#"<<id<<"\tBalance:"<<balance;
}
5_11.cpp
#include "account.h"
#include<iostream>
using namespace std;
int main(){
SavingsAccount sa0(1,21325302,0.015);
SavingsAccount sa1(1,58320212,0.015);
sa0.deposit(5,5000);
sa1.deposit(25,10000);
sa0.deposit(45,5500);
sa1.withdraw(60,4000);
sa0.settle(90);
sa1.settle(90);
sa0.show();cout<<endl;
sa1.show();cout<<endl;
cout<<"Total:"<<SavingsAccount::getTotal()<<endl;
return 0;
}
标签：std,const,对象,double,编程,int,Complex,实验,include From： https://www.cnblogs.com/qc050306/p/18494306