实验任务1
task1.cpp源码
task1_1.cpp:
#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;
};
void test() {
A a(3, 4);
a.show();
B b(3.2, 5.6);
b.show();
}
int main() {
test();
}
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task1_2.cpp:
#include <iostream>
#include <string>
using std::cout;
using std::endl;
//定义模板类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;
};
void test() {
cout << "测试1：模板类抽象类型T用int实例化" << endl;
X<int> x1(3, 4);
x1.show();
cout << "\n测试2：模板类抽象类型T用double实例化" << endl;
X<double> x2(3.2, 5.6);
x2.show();
cout << "\n测试3：模板类抽象类型T用标准库中的string实例化" << endl;
X<std::string> x3("hello", "c plus plus");
x3.show();
}
int main() {
test();
}
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task2.cpp源码
task2_1,.cpp:
#include <iostream>
#include <string>
#include <limits>
using namespace std;
int main() {
const int n = 10;
string prompt = string(n, '*') + "Enter a string: " + string(n, '*') + '\n';
cout << "测试1:";
cout << prompt;
string s1;
cin >> s1; //从输入流中提取字符串给s1，碰到空格、回车、Tab键即结束
cout << "s1: " << s1 << endl;
cin.ignore(numeric_limits<streamsize>::max(), '\n'); //清空缓冲区
cout << "\n测试2: ";
cout << prompt;
getline(cin, s1); //从输入流中提取字符串给s1，直到换行
cout << "s1: " << s1 << endl;
cout << "\n测试3:";
string s2, s3;
cout << prompt;
getline(cin, s2, ' '); //从输入流中提取字符串给s2，直到换行
getline(cin, s3);
cout << "s2: " << s2 << endl;
cout << "s3: " << s3 << endl;
}
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task2_2.cpp:
#include <iostream>
#include <string>
int main() {
using namespace std;
string s;
cout << "Enter words: \n";
//重复录入字符串，将小写字符转换为大写，直到按下ctrl+z
while (getline(cin, s)) {
for (auto& ch : s)
ch = toupper(ch);
cout << s << "\n";
}
}
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task2_3.cpp:
#include <iostream>
#include <string>
#include <algorithm>
int main() {
using namespace std;
string s1;
cout << "Enter words: \n";
getline(cin, s1);
cout << "original words: \n";
cout << s1 << endl;
cout << "to uppercase: \n";
transform(s1.begin(), s1.end(), s1.begin(), ::toupper);
cout << s1 << endl;
}
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task2_4.cpp:
#include <iostream>
#include <string>
int main() {
using namespace std;
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{ "[email protected]" };
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{ "15216982937" };
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;
}
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task3.cpp源码
task3_1.cpp:
#include <iostream>
#include <vector>
template<typename T>
void output(const T& obj) {
for (auto& item : obj)
std::cout << item << ",";
std::cout << "\b\b \n";
}
int main() {
using namespace std;
vector<int> v1;
vector<int> v2(5);
vector<int> v3(5, 42);
vector<int> v4{ 1, 9, 8, 4 };
vector<int> v5{ v4 };
output(v2);
output(v3);
output(v4);
output(v5);
}
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task3_2.cpp:
#include <iostream>
#include <vector>
using std::cout;
using std::endl;
using std::vector;
void output(const vector<int>& v) {
cout << "v.size() = " << v.size() << endl;
cout << "v.capacity() = " << v.capacity() << endl;
cout << endl;
}
int main() {
vector<int> v{ 42 };
output(v);
v.push_back(55);
v.push_back(90);
output(v);
for (auto i = 0; i < 8; i++)
v.push_back(i);
output(v);
v.pop_back();
output(v);
}
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task4.cpp源码
task4.cpp:
#include <iostream>
#include <vector>
#include <array>
#include <string>
#include <algorithm>
using namespace std;
// 函数模板
// 通过索引方式输出对象值
template<typename T>
void output1(const T& obj) {
for (auto i = 0; i < obj.size(); ++i)
cout << obj.at(i) << ", ";
cout << "\b\b \n";
}
// 函数模板
// 通过迭代器方式输出对象值
template<typename T>
void output2(const T& obj) {
for (auto p = obj.cbegin(); p != obj.cend(); ++p)
cout << *p << ", ";
cout << "\b\b \n";
}
// 函数模板
// 通过auto for方式输出对象值
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, 3, 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 << "测试1: " << endl;
test1();
cout << "测试2: " << endl;
test2();
cout << "测试3: " << endl;
test3();
}
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task5.cpp源码
textcoder.hpp：
#include<iostream>
#include<string>
using std::string;
class TextCoder {
private:
string text;
void encoder(){
for (char& c : text) {
if (isalpha(c)) {
if (islower(c)) {
c = ((c - 'a' + 7) % 26) + 'a';
} else {
c = ((c - 'A' + 7) % 26) + 'A';
}
}
}
}
void decoder(){
for (char& c : text) {
if (isalpha(c)) {
if (islower(c)) {
c = ((c - 'a' - 7) % 26) + 'a';
} else {
c = ((c - 'A' - 7) % 26) + 'A';
}
}
}
}
};
public:
TextCoder(string &str): text{str} {};
TextCoder(const TextCoder &t): text{t.text} {};
string get_ciphertext() {
encoder();
return text;
}
string get_deciphertext() {
decoder();
return text;
}
};
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task5.cpp
#include "textcoder.hpp"
#include <iostream>
#include <string>
void test() {
using namespace std;
string text, encoded_text, decoded_text;
cout << "输入英文文本: ";
while (getline(cin, text)) {
encoded_text = TextCoder(text).get_ciphertext(); // 这里使用的是临时无名对象
cout << "加密后英文文本:\t" << encoded_text << endl;
decoded_text = TextCoder(encoded_text).get_deciphertext(); // 这里使用的是临时无名对象
cout << "解密后英文文本:\t" << decoded_text << endl;
cout << "\n输入英文文本: ";
}
}
int main() {
test();
}
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task6.cpp源码
task6.cpp：
#include<iostream>
#include<string>
#include<vector>
#include "info.hpp"
const int capacity = 100;
int main()
{
vector<Info> audience_info_list;
cout << "录入信息：" << endl;
cout << endl;
cout << "昵称 联系方式(邮箱/手机号) 所在城市 预定参加人数 " << endl;
char choice;
int sum=0;
string nickname, contact, city;
int n;
while(cin >> nickname >> contact >> city >> n)
{
sum+=n;
if(sum > capacity)
{
sum-=n;
cout << "对不起，只剩" << capacity-sum << "个位置" << endl;
cout << "1.输入u，更新（update）预定信息" << endl
<< "2.输入q, 退出预定" << endl
<<"你的选择: ";
cin >> choice;
if(choice=='u')
{
cin >> nickname >> contact >> city >> n;
Info a(nickname,contact,city,n);
audience_info_list.push_back(a);
sum+=n;
}
else
break;
}
else audience_info_list.push_back(Info(nickname, contact, city, n));
}
cout << "截至目前，一共有" << sum << "位听众预定参加。预定听众信息如下：" << endl;
for(auto &Info:audience_info_list)
{
Info.print();
}
}
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info.hpp:
#include <iostream>
using namespace std;
class Info {
private:
string nickname;
string contact;
string city;
int n;
public:
Info(string nickname, string contact, string city, int n) : nickname{nickname}, contact{contact}, city{city}, n{n} {};
print() {
cout << "昵称： " << nickname << endl;
cout << "联系方式：" << contact << endl;
cout << "所在城市: " << city << endl;
cout << "预定人数； " << n <<endl;
}
};
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标签：库类,std,string,C++,cpp,using,include,模板,cout From： https://www.cnblogs.com/202283230013nuister/p/17868727.html