实验任务3：
1.complex.hpp
1 #pragma once
2 #include<iostream>
3 #include<cmath>
4 class Complex{ public :
5 Complex(double r=0,double i=0){
6 real=r;imag=i ;}
7 Complex(const Complex &x){
8 real=x.real;
9 imag=x.imag;
10 }
11
12
13 double get_real() const{
14 return real;
15 }
16 double get_imag() const{
17 return imag;
18 }
19 void show() const{
20 using namespace std;
21 if(real==0&&imag==0){cout<<0;}
22 else if(real==0){cout<<imag<<"i";}
23 else if(imag==0){cout<<real;}
24 else{
25 if(imag>0){
26 cout<<real<<"+"<<imag<<"i";
27 }
28
29 else if(imag<0){
30 cout<<real<<"-"<<-imag<<"i";
31 }
32 }
33 }
34
35
36 void add( const Complex &x) {real+=x.real;
37 imag+=x.imag;}
38 friend Complex add(const Complex &c1,const Complex &c2);
39 friend bool is_equal(const Complex &c1,const Complex &c2);
40 friend double abs(const Complex &c1);
41 private:
42 double real;
43 double imag;
44
45
46 };
47 Complex add(const Complex &c1,const Complex &c2){
48 double real=c1.real+c2.real;
49 double imag=c1.imag+c2.imag;
50 return Complex(real,imag);
51 }
52 bool is_equal(const Complex &c1,const Complex&c2){
53 if(c1.real==c2.real&&c1.imag==c2.imag)
54 return true;
55 else return false;
56 }
57 double abs(const Complex &c1){
58 return sqrt(c1.real*c1.real+c1.imag*c1.imag);
59 }
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2.complex.cpp
1 #include"complex.hpp"
2
3
4 void test(){
5 using namespace std;
6 Complex c1(3,-4);
7 const Complex c2(4.5);
8 Complex c3(c1);
9 cout<<"c1=";
10 c1.show();
11 cout<<endl;
12 cout<<"c2.imag="<<c2.get_imag()<<endl;
13 cout<<"c3=";
14 c3.show();
15 cout<<endl;
16 cout<<"abs(c1)=";
17 cout<<abs(c1)<<endl;
18 cout<<boolalpha;
19 cout<<"c1==c3:"<<is_equal(c1,c3)<<endl;
20 cout<<"c1==c2:"<<is_equal(c1,c2)<<endl;
21 Complex c4;
22 c4=add(c1,c2);
23 cout<<"c4=c1+c2=";
24 c4.show();
25 cout<<endl;
26 }
27 int main(){
28 test();
29 }
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实验任务4：
1.User.hpp
1 #include <iostream>
2 #include <string>
3 #include <limits>
4 class User {
5 private:
6 static int n;
7 public:
8 static void print_n();
9 private:
10 std::string name, password, email;
11 public:
12 User(std::string nm,
13 std::string p = "111111",
14 std::string e = ""): name{nm}, password{p}, email{e}
15 {
16 n += 1;
17 };
18 void set_email();
19 void change_passwd();
20 void print_info();
21 };
22 int User::n = 0;
23
24
25
26 void User::print_n() {
27 std::cout << "there are " << n << " users.\n";
28 }
29
30 void User::set_email() {
31 using namespace std;
32 cout << "Enter email address: ";
33 string e;
34 cin >> e;
35 cin.ignore((std::numeric_limits<streamsize>::max)(),'\n');
36 cout << "email is set successfully...\n";
37 email = e;
38 }
39
40 void User::change_passwd() {
41 using namespace std;
42 string o, n;
43 for (int i = 0; i <= 3; i++) {
44 if (i == 3) {
45 cout << "Please try after a while. \n";
46 break;
47 }
48 if (i == 0)
49 cout << "Enter old password: ";
50 else
51 cout << "Please re-enter again: ";
52 cin >> o;
53 cin.ignore((std::numeric_limits<streamsize>::max)(),'\n');
54 if (o != password) {
55 cout << "password input error. ";
56 continue;
57 }
58 else {
59 cout << "Enter new passwd: ";
60 cin >> n;
61 cin.ignore((std::numeric_limits<streamsize>::max)(),'\n');
62 password = n;
63 cout << "new passwd is set successfully...\n";
64 break;
65 }
66 }
67 }
68
69 void User::print_info() {
70 using namespace std;
71 cout << "name: \t" << name << endl;
72 string s(password.size(),'*'); cout << "password: \t" << s << endl;
73 cout << "email: \t" << email << endl;
74 }
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2.task4.cpp
1 #include "User.hpp"
2 #include <iostream>
3
4
5 void test(){
6 using std::cout;
7 using std::endl;
8
9 cout << "testing 1......\n";
10 User user1("Jonny", "92197", "[email protected]");
11 user1.print_info();
12
13 cout << endl
14 << "testing 2......\n\n";
15
16 User user2("刘亦菲");
17 user2.change_passwd();
18 user2.set_email();
19 user2.print_info();
20
21 cout << endl;
22 User::print_n();
23 }
24
25 int main(){
26 test();
27 }
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实验任务5：
1.account.h
1 //account.h
2 #ifndef __ACCOUNT_H__
3 #define __ACCOUNT_H__
4 class SavingsAccount { //储蓄账户类
5 private:
6 int id; //帐号
7 double balance; //余额
8 double rate; //存款的年利率
9 int lastDate; //上次变更余额的时期
10 double accumulation; //余额按日累加之和
11 static double total; //所有帐户的总金额
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() {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__
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2.account.cpp
1 //account.cpp
2 #include "account.h"
3 #include <cmath>
4 #include <iostream>
5 using namespace std;
6
7 double SavingsAccount::total = 0;
8 //SavingsAccount类相关成员函数的实现
9 SavingsAccount::SavingsAccount(int date, int id, double rate)
10 : id(id), balance(0), rate(rate), lastDate (date), accumulation(0) {
11 cout << date << "\t#" << id << " is created" << endl;
12 }
13 void SavingsAccount::record(int date, double amount) {
14 accumulation = accumulate(date);
15 lastDate = date;
16 amount = floor(amount * 100 + 0.5) / 100; //保留小数点后两位
17 balance += amount;
18 total += amount;
19 cout << date << "\t#" << id << "\t" << amount << "\t" << balance << endl;
20 }
21 void SavingsAccount::deposit(int date, double amount) {
22 record(date, amount);
23 }
24 void SavingsAccount::withdraw(int date, double amount) {
25 if ( amount > getBalance())
26 cout << "Error: not enough money" << endl;
27 else
28 record(date, - amount);
29 }
30 void SavingsAccount::settle(int date) {
31 double interest = accumulate(date) * rate / 365;
32 //计算年息
33 if (interest != 0)
34 record(date, interest);
35 accumulation = 0;
36 }
37 void SavingsAccount::show() const {
38 cout << "#" << id << "\tBalance: " << balance;
39 }
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3.5_11.cpp
1 //5_11.cpp
2 #include "account.h"
3 #include <iostream>
4 using namespace std;
5 int main() {
6 //建立几个帐户
7 SavingsAccount sa0(1, 21325302, 0.015);
8 SavingsAccount sa1(1, 58320212, 0.015);
9 //几笔账目
10 sa0.deposit(5, 5000) ;
11 sa1.deposit(25, 10000);
12 sa0.deposit(45, 5500);
13 sa1.withdraw(60, 4000);
14 //开户后第90天到了银行的计息日,结算所有账户的年息
15 sa0.settle(90);
16 sa1.settle(90);
17 //输出各个帐户信息
18 sa0.show();cout << endl;
19 sa1.show();cout << endl;
20 cout << "Total:" << SavingsAccount::getTotal() << endl;
21 return 0;
22 }
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标签：std,cout,int,double,void,实验,include From： https://www.cnblogs.com/shaoshuai-nuist/p/17779346.html