#include <iostream>
using std::cout;
using std::endl;
// 类A的定义
class A{
public:
A(int x0, int y0): x{ x0 }, y{ y0 } {}
void show() const { cout << x << ", " << y << endl; }
private:
int x, y;
};
// 类B的定义
class B{
public:
B(double x0, double y0): x{ x0 }, y{ y0 } {}
void show() const { cout << x << ", " << y << endl;}
private:
double x, y;
};
int main() {
A a(3, 4);
a.show();
B b(3.2, 5.6);
b.show();
}
#include <iostream>
#include <string>
using std::cout;
using std::endl;
// 定义类模板X
template<typename T>
class X{
public:
X(T x0, T y0): x{x0}, y{y0} {}
void show() const { cout << x << ", " << y << endl;}
private:
T x, y;
};
int main() {
X<int> x1(3, 4);
x1.show();
X<double> x2(3.2, 5.6);
x2.show();
X<std::string> x3("hello", "c plus plus");
x3.show();
}
#include <iostream>
#include <string>
using namespace std;
int main()
{
string s1,s2;
s1 = "nuist";
s1[0] = 'N';
s1.at(1) = 'U';
cout << boolalpha << (s1 =="nuist") << endl;
cout << s1.length() << endl;
cout << s1.size() << endl;
s2 = s1 + ", 2050";
cout << s2 << endl;
string email{"xyz@gmail.com"};
auto pos = email.find("@");
if(pos == string::npos)
cout << "illegal email address";
else {
auto s1 = email.substr(0, pos);
auto s2 = email.substr(pos + 1);
cout << s1 << endl;
cout << s2 << endl;
}
string phone{"13405862003"};
cout << phone.replace(3, 5,string(5, '*')) << endl;
string s3{"cosmos"}, s4{"galaxy"};
cout << "s3: " + s3 + "s4: " + s4 << endl;
s3.swap(s4);
cout << "s3: " + s3 + "s4: " + s4 << endl;
string s5{"abc"};
const char *pstr = s5.c_str();
cout << pstr << endl;
string s6{"12306"};
int x1 = stoi(s6);
cout << x1 << endl;
int x2 = 12306;
string s7 = to_string(x2);
cout << s7 << endl;
double x3 = 123.06;
string s8 = to_string(x3);
cout << s8 << endl;
return 0;
}
#include<iostream>
#include<string>
#include<limits>
int main()
{
using namespace std;
const int n = 10;
string prompt = string(n,'*') + "Enter a string: " + string(n, '*') + '\n';
cout << prompt;
string s1;
cin >> s1;
cout << "s1: " << s1 << endl;
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cout << prompt;
getline(cin, s1);
cout << "s1: " << s1 << endl;
string s2, s3;
cout << prompt;
getline(cin, s2, ' ');
getline(cin, s3);
cout << "s2: " << s2 << endl;
cout << "s3: " << s3 << endl;
}
#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<array>
using namespace std;
template<typename T>
void output1(const T &obj)
{
for(auto i = 0;i < obj.size();++ i)
cout << obj.at(i) << ", ";
cout << "\b\b \n";
}
template<typename T>
void output2(const T &obj) {
for(auto p = obj.cbegin();p != obj.cend(); ++p)
cout << *p << ", ";
cout << "\b\b \n";
}
template<typename T>
void output3(const T &obj){
for(auto &item: obj)
cout << item << ", ";
cout << "\b\b \n";
}
// 测试string类对象
void test1() {
string s1{"cplus"};
output1(s1);
reverse(s1.begin(), s1.end()); // 对对象s1中的数据项进⾏翻转
output2(s1);
sort(s1.begin(), s1.end()); // 对对象s1中的数据项排序(默认升序)
output3(s1);
}
// 测试array<int>类对象
void test2() {
array< array<int, 4>, 3> x{1, 9, 8, 4, 2, 0, 2, 2, 2, 0, 4, 9 };
output1( x.at(0) );
output2( x.at(1) );
output3( x.at(2) );
}
// 测试vector<string>类对象
void test3() {
vector<string> v1 {"Sheldon", "Leonard", "Howard", "Raj"};
v1.push_back("Penny");
v1.push_back("Amy");
output1(v1);
sort(v1.begin(), v1.end(), std::greater<string>()); // 对v1对象中的字符串按降序排序
output2(v1);
reverse(v1.begin(), v1.end()); // 对v1对象中的字符串翻转
output3(v1);
}
int main() {
cout << "test1: " << endl;
test1();
cout << "test2: " << endl;
test2();
cout << "test3: " << endl;
test3();
}
#include<iostream>
#include<string>
#include<vector>
#include"info.hpp"
#include<iomanip>
using namespace std;
const int capacity = 100;
int main()
{
string nickname,contact,city;
int num,cnt = 0;
vector<info> audience_info_list;
cout << "please enter informance" << endl;
cout << "nickname\t\t" << "contact(email/phone)\t\t" << "city\t"<<"reserved number\t" << endl;
while(cin >> nickname)
{
cin >> contact >> city >> num;
cnt += num;
if(capacity > cnt){
info x = info(nickname,contact,city,num);
audience_info_list.push_back(x);
}
else{
cnt -= num;
cout << "sorry,only left" << (capacity - cnt) << "sits." << endl;
}
cout << "entil now,all have" << cnt << "audiences, the information are as follow: "<< endl;
for(int i= 0;i < audience_info_list.size();i ++)
{
audience_info_list.at(i).print();
cout << endl;
}
cout << "1.enter'u',update information" << endl;
cout << "2.enter'q',to quit reserve" << endl;
cout << "your choice: ";
string n;
cin >> n;
if(n == "q") break;
else if(n =="u")
{
cout << "please enter information " << endl;
cout << "nickname\t\t" << "contact(email/phone)\t\t" << "city\t"<<"reserved number\t" << endl;
continue;
}
}
return 0;
}
//info.hpp
#pragma once
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class info
{
public :
info(string nickname0="a",string contact0= "a",string city0="a",int num0 = 0):nickname{nickname0},contact{contact0},city{city0},num{num0} {}
void print() const;
private:
string nickname,contact,city;
int num;
};
void info::print() const{
cout << "nickname: \t\t" << nickname << endl;
cout << "contact: \t" << contact << endl;
cout << "city: \t\t" << city << endl;
cout << "reserve number: \t" << num << endl;
}
// cpp
#include "textcoder.hpp"
#include <iostream>
#include <string>
void test(){
using namespace std;
string text,encoded_text,decoded_text;
cout<<"please enter the text:";
while(getline(cin,text)){
encoded_text=TextCoder(text).get_ciphertext();
cout<<"the text encodered:\t"<<encoded_text<<endl;
decoded_text=TextCoder(encoded_text).get_deciphertext();
cout<<"the encodered text discodered:\t"<<decoded_text<<endl;
cout<<"please enter the text: ";
}
}
int main(){
test();
}
// hpp
#include <iostream>
#include <string>
using namespace std;
class TextCoder{
public:
TextCoder(string tx);
string get_ciphertext();
string get_deciphertext();
void ciphertext();
void deciphertext();
private:
string text;
};
TextCoder::TextCoder(string tx){
text=tx;
}
void TextCoder::ciphertext(){
for(int i=0;i<=text.size();i++){
if(text[i]>='a'&&text[i]<='u'){
text[i]+=5;
}
else if(text[i]>='A'&&text[i]<='U'){
text[i]+=5;
}
else if(text[i] >'u'&&text[i]<='z'){
text[i]-=21;
}
else if(text[i]>'U'&&text[i]<'Z'){
text[i]-=21;
}
}
}
void TextCoder::deciphertext(){
for(int i=0;i<=text.size();i++){
if(text[i]>=70&&text[i]<=90){
text[i]-=5;
}
else if(text[i]>=102&&text[i]<=122){
text[i]-=5;
}
else if(text[i]>=65&&text[i]<=69){
text[i]+=21;
}
else if(text[i]>=97&&text[i]<=101){
text[i]+=21;
}
}
}
string TextCoder::get_ciphertext(){
this->ciphertext();
return text;
}
string TextCoder::get_deciphertext(){
this->deciphertext();
return text;
}
