实验任务1
程序源码
#include <iostream>
#include <complex>
int main(){
using namespace std;
complex<double> c1{3, 4}, c2{4.5};
const complex<double> c3{c2};
cout << "c1 = " << c1 << endl;
cout << "c2 = " << c2 << endl;
cout << "c3 = " << c3 << endl;
cout << "c3.real = " << c3.real() << endl;
cout << "c3.imag = " << c3.imag() << endl;
cout << "c1 + c2 = " << c1 + c2 << endl;
cout << "c1 - c2 = " << c1 - c2 << endl;
cout << "abs(c1) = " << abs(c1) << endl;
cout << boolalpha;
cout << "c1 == c2 : " << (c1 == c2) << endl;
cout << "c3 == c2 : " << (c3 == c2) << endl;
complex<double> c4 = 2;
cout << "c4 = " << c4 << endl;
c4 += c1;
cout << "c4 = " << c4 << endl;
}
测试结果
实验任务2
程序源码
#include <iostream>
#include <array>
#include <string>
// 模板函数
// 对满足特定条件的序列类型T，使用范围for输出
template<typename T>
void output1(const T &obj) {
for(auto i: obj)
std::cout << i << ", ";
std::cout << "\b\b \n";
}
// 模板函数
// 对满足特定条件的序列类型T，使用迭代器输出
template<typename T>
void output2(const T &obj) {
for(auto p = obj.cbegin(); p != obj.cend(); ++p) //使用const迭代器
std::cout << *p << ", ";
std::cout << "\b\b \n";
}
int main(int argc, char const *argv[]) {
using namespace std;
array<int, 5> x1; // 创建一个array对象，包含5个int类型元素，未初始化
cout << "x1.size() = " << x1.size() << endl; // 输出元素个数
x1.fill(42); // 将x1的所有元素值都赋值为42
x1.at(0) = 999; // 把下标为0的元素修改为999
x1.at(4) = -999; // 把下标为4的元素修改为-999
x1[1] = 777; // 把下标为1的元素修改为777
cout << "x1: ";
output1(x1);
cout << "x1: ";
output2(x1);
array<double, 10> x2{1.5, 2.2}; // 创建要给array对象，包含10个double类型元素，初始化部分元素
cout << "x2.size() = " << x2.size() << endl;
cout << "x2: ";
output1(x2);
array<int,5> x3(x1);
cout << boolalpha << (x1 == x3) << endl;
x3.fill(22);
cout << "x3: ";
output1(x3);
swap(x1, x3); // 交换x1和x3的数据
cout << "x1: ";
output1(x1);
cout << "x3: ";
output1(x3);
}
测试结果
实验任务3
程序源码
- employee.hpp
#pragma once
// Employee绫荤殑瀹氫箟
#include <iostream>
#include <string>
#include <iomanip>
using std::string;
using std::cout;
using std::endl;
using std::setfill;
using std::setw;
using std::left;
using std::right;
using std::to_string;
struct Date {
int year;
int month;
int day;
};
class Employee
{
public:
Employee();
Employee(string name0, double salary0, int y, int m, int d = 1);
void set_info(string name0, double salary0, int y, int m, int d = 1);
string get_name() const;
double get_salary() const;
void display_info() const;
void update_salary(double s);
void update_hire_date(int y, int m, int d);
void raise_salary(double by_percent);
public:
static void display_count();
private:
string id;
string name;
double salary;
Date hire_date;
public:
static const string doc;
private:
static int count;
};
const string Employee::doc {"a simple Employee class"};
int Employee::count = 0;
Employee::Employee(): id{ to_string(count+1) } {
++count;
}
Employee::Employee(string name0, double salary0, int y, int m, int d):
id{to_string(count+1)}, name{name0}, salary{salary0}, hire_date{y, m, d} {
++count;
}
void Employee::set_info(string name0, double salary0, int y, int m, int d) {
name = name0;
salary = salary0;
hire_date.year = y;
hire_date.month = m;
hire_date.day = d;
}
string Employee::get_name() const {
return name;
}
double Employee::get_salary() const {
return salary;
}
void Employee::display_info() const {
cout << left << setw(15) << "id: " << id << endl;
cout << setw(15) << "name: " << name << endl;
cout << setw(15) << "salary: " << salary << endl;
cout << setw(15) << "hire_date: " << hire_date.year << "-";
cout << std::right << setfill('0') << setw(2) << hire_date.month << "-" << setw(2) << hire_date.day;
cout << setfill(' ');
}
void Employee::update_salary(double s) {
salary = s;
}
void Employee::update_hire_date(int y, int m, int d) {
hire_date.year = y;
hire_date.month = m;
hire_date.day = d;
}
void Employee::raise_salary(double by_percent) {
double raise = salary * by_percent / 100;
salary += raise;
}
void Employee::display_count() {
cout << "there are " << count << " employees\n";
}
- task3.cpp
#include "Employee.hpp"
#include <iostream>
void test() {
using std::cout;
using std::endl;
cout << Employee::doc << endl << endl;
Employee employee1;
employee1.set_info("Sam", 30000, 2015, 1, 6);
employee1.update_hire_date(2017, 6, 30);
employee1.update_salary(35000);
employee1.display_info();
cout << endl << endl;
Employee employee2{"Tony", 20000, 2020, 3, 16};
employee2.raise_salary(15);
employee2.display_info();
cout << endl << endl;
Employee::display_count();
}
int main() {
test();
}
测试结果
实验任务4
程序源码（已更换测试数据）
- Complex.hpp文件源码
#include<iostream>
#include<cmath>
using std::cout;
using std::endl;
class Complex
{
public:
Complex ();
Complex (double x,double y=0);
Complex (const Complex& x);
~Complex()=default;
double get_real()const{return real;}
double get_imag()const{return imag;}
void show() const;
void add(Complex const& c1);
friend Complex add(Complex const& c1,Complex const& c2);
friend bool is_equal(Complex const& c1,Complex const& c2);
friend double abs(Complex const& c1);
private:
double real;
double imag;
};
Complex::Complex():real{0},imag{0}{}
Complex::Complex(double x,double y):real{x},imag{y}{}
Complex::Complex(const Complex& x):real{x.real},imag{x.imag}{}
void Complex::show()const{
if(imag>0)
cout<<real<<"+"<<imag<<"i";
else if(imag<0)
cout<<real<<imag<<"i";
else
cout<<real;
}
void Complex::add(Complex const& c1){
real+=c1.real;
imag+=c1.imag;
}
Complex add(Complex const& c1,Complex const& c2){
Complex c3;
c3.real=c1.real +c2.real;
c3.imag=c1.imag +c2.imag;
return c3;
}
bool is_equal(Complex const& c1,Complex const& c2){
if(c1.real==c2.real&&c1.imag==c2.imag)
return true;
else
return false;
}
double abs(Complex const& c1){
return sqrt(c1.real*c1.real+c1.imag*c1.imag);
}
- task4.cpp源码
#include "Complex.hpp"
#include <iostream>
void test() {
using namespace std;
Complex c1(7, -24);
const Complex c2(2.5);
Complex c3(c1);
cout << "c1 = ";
c1.show();
cout << endl;
cout << "c2 = ";
c2.show();
cout << endl;
cout << "c2.imag = " << c2.get_imag() << endl;
cout << "c3 = ";
c3.show();
cout << endl;
cout << "abs(c1) = ";
cout << abs(c1) << endl;
cout << boolalpha;
cout << "c1 == c3 : " << is_equal(c1, c3) << endl;
cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
Complex c4;
c4 = add(c1, c2);
cout << "c4 = c1 + c2 = ";
c4.show();
cout << endl;
c1.add(c2);
cout << "c1 += c2, " << "c1 = ";
c1.show();
cout << endl;
}
int main() {
test();
}
测试结果（已更换测试数据）
实验任务5
程序源码（已更换测试数据）
- User.hpp文件源码
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class User{
public:
User(string name,string passwd="111111",string email="");
~User()=default;
void set_email();
void change_passwd();
void print_info();
static void print_n();
private:
string name;
string passwd;
string email;
static int n;
};
User::User(string name,string passwd,string email) :name{name},passwd{passwd},email{email}{n++;}
int User::n=0;
void User::set_email(){
cout<<"Enter email address:";
cin>>email;
cout<<"email is set successfully..."<<endl;
}
void User::change_passwd(){
string t;
int i;
cout << "Enter old password: ";
cin >> t;
while (i <2 )
{
if (passwd == t)
{
cout << "Enter new password: ";
cin >> passwd;
cout << "new passwd is set successfully..." << endl;
break;
}
else
{
i++;
cout << "password input error. Please re-enter again: ";
cin >> t;
}
}
if (i ==2 )
{
cout << "password input error. Please try after a while." << endl;
}
}
void User::print_info()
{
string starPasswd(passwd.length(), '*');
cout << setfill(' ') << setw(8) << left <<"name:"<< name << endl
<< setfill(' ') << setw(8) << left <<"passwd:"<< starPasswd << endl
<< setfill(' ') << setw(8) << left <<"email:"<< email << endl;
}
void User::print_n(){
if(n==1)
cout<<"there is 1 user."<<endl;
else
cout<<"there are "<<n<<" users."<<endl;
}
- task5.cpp源码
#include "User.hpp"
#include <iostream>
void test() {
using std::cout;
using std::endl;
cout << "testing 1......\n";
User user1("Eliwa", "9251995", "[email protected]");
user1.print_info();
cout << endl
<< "testing 2......\n\n";
User user2("Kim");
user2.change_passwd();
user2.set_email();
user2.print_info();
cout << endl;
User::print_n();
}
int main() {
test();
}
测试结果（已更换测试数据）
标签：const,string,对象,void,int,Complex,实验,cout From： https://www.cnblogs.com/xu2993610/p/16785338.html