任务一：
//t.h
#include"t.h"
#include<iostream>
#include<string>
using std::cout;
using std::endl;
using std::string;
const std::string T::doc{"a simple class sample"};
const int T::max_cnt=999;
int T::cnt=0;
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<<")";
}
int T::get_cnt(){
return cnt;
}
void func(){
T t5(42);
t5.m2=2049;
cout<<"t5=";
t5.display();
cout<<endl;
}
//t.cpp
#pragma once #include <string> // 类T: 声明 class T { // 对象属性、方法 public: T(int x = 0, int y = 0); // 普通构造函数 T(const T &t); // 复制构造函数 T(T &&t); // 移动构造函数 ~T(); // 析构函数 void adjust(int ratio); void display() const; private: int m1,m2; public: static int get_cnt(); public: static const std::string doc; static const int max_cnt; private: static int cnt; friend void func(); }; void func();
//task1.cpp
#include"t.h" #include<iostream> using std::cout; using std::endl; void test(); int main(){ test(); cout<<"\nmain:\n"; cout<<"T objects'current count:"<<T::get_cnt()<<endl; } void test(){ cout<<"test class T:\n"; cout<<"T info:"<<T::doc<<endl; cout<<"T object'max xount:"<<T::max_cnt<<endl; cout<<"T object'current count:"<<T::get_cnt()<<endl<<endl; T t1; cout<<"t1="; t1.display(); cout<<endl; T t2(3,4); cout<<"t2=";t2.display();cout<<endl; T t3(t2); t3.adjust(2); cout<<"t3=";t3.display();cout<<endl; T t4(std::move(t2)); cout<<"t3=";t4.display();cout<<endl; cout <<"T objeacts'current count:"<<T::get_cnt()<<endl; func(); }
问题1：不能
func()函数未声明
问题2：复制构造函数：用于创建一个新的对象，作为现有对象的副本
移动构造函数：用于从一个“右值”移动资源到新对象，避免不必要的复制
析构函数：在对象生命周期结束时自动调用，用于释放对象占用的资源
问题3：程序不能正常编译
任务二：
#ifndef COMPLEX_H
#define COMPLEX_H
#include <iostream>
#include <string>
#include <cmath>
class Complex {
public:
static const std::string doc;
Complex();
Complex(double real);
Complex(double real, double imag);
Complex(const Complex& other);
double get_real() const;
double get_imag() const;
void add(const Complex& other);
friend Complex add(const Complex& c1, const Complex& c2);
friend bool is_equal(const Complex& c1, const Complex& c2);
friend bool is_not_equal(const Complex& c1, const Complex& c2);
friend void output(const Complex& c);
friend double abs(const Complex& c);
private:
double real;
double imag;
};
#endif // COMPLEX_H
#include "Complex.h"
const std::string Complex::doc = "a simplified complex class";
Complex::Complex() : real(0), imag(0) {}
Complex::Complex(double real) : real(real), imag(0) {}
Complex::Complex(double real, double imag) : real(real), imag(imag) {}
Complex::Complex(const Complex& other) : real(other.real), imag(other.imag) {}
double Complex::get_real() const {
return real;
}
double Complex::get_imag() const {
return imag;
}
void Complex::add(const Complex& other) {
real += other.real;
imag += other.imag;
}
Complex add(const Complex& c1, const Complex& c2) {
return Complex(c1.real + c2.real, c1.imag + c2.imag);
}
bool is_equal(const Complex& c1, const Complex& c2) {
return c1.real == c2.real && c1.imag == c2.imag;
}
bool is_not_equal(const Complex& c1, const Complex& c2) {
return !(c1.real == c2.real && c1.imag == c2.imag);
}
void output(const Complex& c) {
std::cout << c.real;
if (c.imag >= 0)
std::cout << "+";
std::cout << c.imag << "i" << std::endl;
}
double abs(const Complex& c) {
return std::sqrt(c.real * c.real + c.imag * c.imag);
}
#include "Complex.h"
#include <iostream>
using std::cout;
using std::endl;
using std::boolalpha;
void test() {
cout << "类成员测试: " << endl;
cout << Complex::doc << endl;
cout << endl;
cout << "Complex对象测试: " << endl;
Complex c1;
Complex c2(3, -4);
const Complex c3(3.5);
Complex c4(c3);
cout << "c1 = "; output(c1); cout << endl;
cout << "c2 = "; output(c2); cout << endl;
cout << "c3 = "; output(c3); cout << endl;
cout << "c4 = "; output(c4); cout << endl;
cout << "c4.real = " << c4.get_real() << ", c4.imag = " << c4.get_imag() << endl;
cout << endl;
cout << "复数运算测试: " << endl;
cout << "abs(c2) = " << abs(c2) << endl;
c1.add(c2);
cout << "c1 += c2, c1 = "; output(c1); cout << endl;
cout << boolalpha;
cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
cout << "c1 != c3 : " << is_not_equal(c1, c3) << endl;
c4 = add(c2, c3);
cout << "c4 = c2 + c3, c4 = "; output(c4); cout << endl;
}
int main() {
test();
}
任务三：
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 }
任务四：
#pragma once
#include<string>
using namespace std;
class Fraction{
public:
static const string doc;
public:
Fraction(int x,int y=1);
Fraction(const Fraction &f);
const int get_up();
const int get_down();
Fraction negative();
public:
friend void output(const Fraction &f);
friend Fraction add(Fraction f1,Fraction f2);
friend Fraction sub(Fraction f1,Fraction f2);
friend Fraction mul(Fraction f1,Fraction f2);
friend Fraction div(Fraction f1,Fraction f2);
private:
int up;
int down;
};
#include<iostream>
#include"Fraction.h"
#include<string>
using namespace std;
int max(int x,int y){
int a=abs(x);
int b=abs(y);
while (b)
{
int tmp=a;
a=b;
b=tmp%b;
}
return a;
}
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";
Fraction::Fraction(int x,int y):up{x},down{y}{}
Fraction::Fraction(const Fraction &f):up{f.up},down{f.down}{}
const int Fraction::get_up(){
return up/max(up,down);
}
const int Fraction::get_down(){
return down/max(up,down);
}
Fraction Fraction::negative(){
int new_up=-up;
Fraction f(new_up,down);
return f;
}
void output(const Fraction &f){
if (f.down==0)
{
cout<<"分母不能为0";
return ;
}
int new_down=f.down/max(f.up,f.down);
if (new_down==1)
cout<<f.up/max(f.up,f.down);
else if (f.up*f.down>0)
cout<<abs(f.up)/max(f.up,f.down)<<"/"<<abs(f.down)/max(f.up,f.down);
else
cout<<"-"<<abs(f.up)/max(f.up,f.down)<<"/"<<abs(f.down)/max(f.up,f.down);
}
Fraction sub(Fraction f1,Fraction f2)
{
int new_down=f1.down*f2.down;
int new_up=f1.up*f2.down-f2.up*f1.down;
new_up/=max(new_up,new_down);new_down/=max(new_up,new_down);
Fraction f(new_up,new_down);
return f;
}
Fraction add(const Fraction f1,const Fraction f2)
{
int new_down=f1.down*f2.down;
int new_up=f1.up*f2.down+f2.up*f1.down;
new_up/=max(new_up,new_down);new_down/=max(new_up,new_down);
Fraction f(new_up,new_down);
return f;
}
Fraction div(Fraction f1,Fraction f2)
{
int new_up=f1.up*f2.down;
int new_down=f1.down*f2.up;
new_up/=max(new_up,new_down);new_down/=max(new_up,new_down);
Fraction f(new_up,new_down);
return f;
}
Fraction mul(Fraction f1,Fraction f2)
{
int new_up=f1.up*f2.up;
int new_down=f1.down*f2.down;
new_up/=max(new_up,new_down);new_down/=max(new_up,new_down);
Fraction f(new_up,new_down);
return f;
}
#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();
}
任务五：
1 //account.h
2 #ifndef__ACCOUNT_H__
3 #define__ACCOUNT_H__
4 class SavingAccount{ //储蓄账户类
5 private:
6 int id; //账号
7 double balance; //余额
8 double rate; //存款的年利率
9 int lastDate; //上次变更余额的时间
10 double accumulation; //余额按日累加之和
11 static double total; //所有账户的总金额
12 //记录一笔账，date为日期，amount为金额，desc为说明
13 void record(int date,double amount);
14 //获得到指定日期为止的存款金额按日累积值
15 double accumulate(int date)const{
16 return accumulation+balance*(date-lastDate);
17 }
18 public:
19 //构造函数
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()const{return total;}
25 void deposit(int date ,double amount); //存入现金
26 void withdraw(int date,double amount); //取出现金
27 //结算利息，每年1月1日调用一次该函数
28 void settle(int date);
29 //显示账户信息
30 void show()const;
31 };
32 #endif/ /__ACCOUNT_H__
1 //account.cpp
2 #include"account.h"
3 #include<cmath>
4 #include<iostream>
5 using namespace std;
6 double SavingsAccount::total=0;
7 //SavingsAccount类相关成员函数的实现
8 SavingsAccount::SavingsAccount(int date,int id,double rate)
9 :id(id),balance(0),rate(rate),lastDate(date),accumulation(0){
10 cout<<date<<"\t#"<<id<<"is created"<<endl;
11 }
12 void SavingsAcount::record(int date,double amount){
13 accumulation=accmulate(date);
14 lastDate=date;
15 amount=floor(amount*100+0.5)/100; //保留小数点后两位
16 balance+=amount;
17 total+=amount;
18 cout<<date<<"\t#"<<id<<"\t"<<amount<<"\t"<<balance<<endl;
19 }
20 void SavingsAccount::deposit(int date,double amount){
21 record(date,amount);
22 }
23 void SavingsAccount::withdraw(int date,double amount){
24 if(amount>getBalance())
25 cout<<"Error:not enough money"<<endl;
26 else
27 record(date-amount);
28 }
29 void SavingsAccount::settle(int date){
30 double interest=accumulate(date)*rate/365; //计算年息
31 if(interest!=0)
32 record(date,interest);
33 accumulation=0;
34 }
35 void SavingsAccount::show()const{
36 cout<<"#"<<id<<"\tBalance:"<<balance;
37 }
1 #include"account.h"
2 #include<iostream>
3 using namespace std;
4 int main(){
5 //建立几个账户
6 SavingsAccount sa0(1,21325302,0.015);
7 SavingsAccount sa1(1,58320212,0.015);
8 //几笔账目
9 sa0.deposit(5,5000);
10 sa1.deposit(25,10000);
11 sa0.deposit(45,5500)
12 sa1.withdraw(60,4000);
13 //开户后第90天到了银行的计息日，结算所有账户的年息
14 sa0.settle(90);
15 sa1.settle(90);
16 //输出各个账户信息
17 sa0.show();cout<<endl;
18 sa1.show();cout<<endl;
19 cout<<"Total:"<<SavingSAccount::getTotal()<<endl;
20 return 0;
21 }
标签：const,int,double,Complex,实验,Fraction,cpp,include From： https://www.cnblogs.com/hb879655/p/18494424