实验任务1
task1.cpp源码
task1_1.cpp:
1 #include <iostream>
2
3 using std::cout;
4 using std::endl;
5
6 //类A的定义
7 class A{
8 public:
9 A(int x0, int y0): x{x0}, y {y0} {}
10 void show() const {cout << x << "," << y << endl;}
11 private:
12 int x, y;
13 };
14
15 //类B的定义
16 class B{
17 public:
18 B(double x0, double y0): x{x0}, y {y0} {}
19 void show() const {cout << x << "," << y << endl;}
20 private:
21 double x, y;
22 };
23
24 void test(){
25 A a(3,4);
26 a.show();
27
28 B b(3.2, 5.6);
29 b.show();
30 }
31
32 int main() {
33 test();
34 }
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task1_2.cpp:
1 #include <iostream>
2 #include <string>
3
4 using std::cout;
5 using std::endl;
6
7 //定义模板类X
8 template<typename T>
9 class X{
10 public:
11 X(T x0, T y0):x{x0}, y{y0} {}
12 void show() const {cout << x << "," << y << endl;}
13 private:
14 T x, y;
15 };
16
17 void test() {
18 cout <<"测试1：模板类抽象类型T用int实例化" << endl;
19 X<int> x1(3,4);
20 x1.show();
21
22 cout <<"\n测试2：模板类抽象类型T用double实例化" << endl;
23 X<double> x2(3.2,5.6);
24 x2.show();
25
26 cout <<"\n测试3：模板类抽象类型T用标准库中的string实例化" << endl;
27 X<std::string> x3("hello","c plus plus");
28 x3.show();
29 }
30
31 int main() {
32 test();
33 }
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task2.cpp源码
task2_1,.cpp:
1 #include <iostream>
2 #include <string>
3 #include <limits>
4
5 using namespace std;
6
7 int main() {
8
9
10 const int n = 10;
11 string prompt = string(n,'*') + "Enter a string: " + string(n,'*') + '\n';
12
13 cout << "测试1:";
14 cout << prompt;
15 string s1;
16 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
17 cout << "s1: " << s1 << endl;
18 cin.ignore(numeric_limits<streamsize>::max(), '\n'); //清空缓冲区
19
20 cout <<"\n测试2: ";
21 cout << prompt;
22 getline(cin,s1); //从输入流中提取字符串给s1，直到换行
23 cout << "s1: " << s1 << endl;
24
25 cout << "\n测试3:";
26 string s2, s3;
27 cout << prompt;
28 getline(cin,s2,' '); //从输入流中提取字符串给s2，直到换行
29 getline(cin,s3);
30 cout << "s2: " << s2 << endl;
31 cout << "s3: " << s3 << endl;
32 }
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task2_2.cpp:
1 #include <iostream>
2 #include <string>
3
4 int main() {
5 using namespace std;
6
7 string s;
8
9 cout << "Enter words: \n";
10 //重复录入字符串，将小写字符转换为大写，直到按下ctrl+z
11 while( getline(cin, s)){
12 for(auto &ch: s)
13 ch = toupper(ch);
14 cout << s << "\n";
15 }
16 }
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task2_3.cpp:
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4
5 int main(){
6 using namespace std;
7
8 string s1;
9
10 cout << "Enter words: \n";
11 getline(cin, s1);
12 cout << "original words: \n";
13 cout << s1 <<endl;
14 cout << "to uppercase: \n";
15 transform(s1.begin(), s1.end(), s1.begin(), ::toupper);
16 cout << s1 << endl;
17 }
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运行测试结果：
task2_4.cpp:
1 #include <iostream>
2 #include <string>
3
4 int main() {
5 using namespace std;
6
7 string s1, s2;
8 s1 = "nuist";
9 s1[0] = 'N';
10 s1.at(1) = 'U';
11 cout << boolalpha << (s1 == "nuist") << endl;
12 cout << s1.length() << endl;
13 cout << s1.size() << endl;
14 s2 = s1 + ", 2050";
15 cout << s2 << endl;
16
17 string email{"[email protected]"};
18 auto pos = email.find("@");
19 if(pos == string::npos)
20 cout << "illegal email address";
21 else{
22 auto s1 = email.substr(0, pos);
23 auto s2 = email.substr(pos + 1);
24 cout << s1 << endl;
25 cout << s2 << endl;
26 }
27
28 string phone{"15216982937"};
29 cout << phone.replace(3, 5, string(5, '*')) << endl;
30
31 string s3{"cosmos"} , s4{"galaxy"};
32 cout << "s3: " + s3 + "s4: " + s4 << endl;
33 s3.swap(s4);
34 cout << "s3: " + s3 + "s4: " + s4 << endl;
35
36 string s5{"abc"};
37 const char*pstr = s5.c_str();
38 cout << pstr << endl;
39
40 string s6{"12306"};
41 int x1 = stoi(s6);
42 cout << x1 << endl;
43
44 int x2 = 12306;
45 string s7 = to_string(x2);
46 cout << s7 << endl;
47
48 double x3 = 123.06;
49 string s8 = to_string(x3);
50 cout << s8 << endl;
51 }
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运行测试结果：
task3.cpp源码
task3_1.cpp:
1 #include <iostream>
2 #include <vector>
3
4
5 template<typename T>
6 void output(const T &obj) {
7 for(auto &item: obj)
8 std::cout << item << ",";
9 std::cout << "\b\b \n";
10 }
11
12 int main(){
13 using namespace std;
14
15 vector<int> v1;
16 vector<int> v2(5);
17 vector<int> v3(5,42);
18 vector<int> v4{1, 9, 8, 4};
19 vector<int> v5{v4};
20
21 output(v2);
22 output(v3);
23 output(v4);
24 output(v5);
25 }
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运行测试结果：
task3_2.cpp:
1 #include <iostream>
2 #include <vector>
3
4 using std::cout;
5 using std::endl;
6 using std::vector;
7
8 void output(const vector<int> &v) {
9 cout << "v.size() = " << v.size() << endl;
10 cout << "v.capacity() = " << v.capacity() << endl;
11 cout << endl;
12 }
13
14 int main() {
15 vector<int> v{42};
16 output(v);
17
18 v.push_back(55);
19 v.push_back(90);
20 output(v);
21
22 for(auto i = 0; i < 8; i++)
23 v.push_back(i);
24 output(v);
25
26 v.pop_back();
27 output(v);
28 }
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运行测试结果：
task4.cpp源码
task4.cpp:
1 #include <iostream>
2 #include <vector>
3 #include <array>
4 #include <string>
5 #include <algorithm>
6
7 using namespace std;
8
9 // 函数模板
10 // 通过索引方式输出对象值
11 template<typename T>
12 void output1(const T &obj) {
13 for(auto i = 0; i < obj.size(); ++i)
14 cout << obj.at(i) << ", ";
15 cout << "\b\b \n";
16 }
17
18 // 函数模板
19 // 通过迭代器方式输出对象值
20 template<typename T>
21 void output2(const T &obj) {
22 for(auto p = obj.cbegin(); p != obj.cend(); ++p)
23 cout << *p << ", ";
24 cout << "\b\b \n";
25 }
26
27 // 函数模板
28 // 通过auto for方式输出对象值
29 template<typename T>
30 void output3(const T &obj) {
31 for(auto &item: obj)
32 cout << item << ", ";
33 cout << "\b\b \n";
34 }
35
36 // 测试string类对象
37 void test1() {
38 string s1{"cplus"};
39
40 output1(s1);
41
42 reverse(s1.begin(), s1.end()); // 对对象s1中的数据项进行翻转
43 output2(s1);
44
45 sort(s1.begin(), s1.end()); // 对对象s1中的数据项排序(默认升序)
46 output3(s1);
47 }
48
49 // 测试array<int>类对象
50 void test2() {
51 array< array<int, 4>, 3> x{1, 9, 8, 4, 2, 0, 2, 3, 2, 0, 4, 9 };
52
53 output1( x.at(0) );
54 output2( x.at(1) );
55 output3( x.at(2) );
56 }
57
58 // 测试vector<string>类对象
59 void test3() {
60 vector<string> v1 {"Sheldon", "Leonard", "Howard", "Raj"};
61
62 v1.push_back("Penny");
63 v1.push_back("Amy");
64
65 output1(v1);
66
67 sort(v1.begin(), v1.end(), std::greater<string>()); // 对v1对象中的字符串按降序排序
68 output2(v1);
69
70 reverse(v1.begin(), v1.end()); // 对v1对象中的字符串翻转
71 output3(v1);
72 }
73
74 int main() {
75 cout << "测试1: " << endl;
76 test1();
77
78 cout << "测试2: " << endl;
79 test2();
80
81 cout << "测试3: " << endl;
82 test3();
83 }
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运行测试结果：
task5.cpp源码
textcoder.hpp：
1 #include<iostream>
2 #include<string>
3
4 using std::string;
5
6 class TextCoder {
7 private:
8 string text;
9 void encoder(){
10 for (char& c : text) {
11 if (isalpha(c)) {
12 if (islower(c)) {
13 c = ((c - 'a' + 7) % 26) + 'a';
14 } else {
15 c = ((c - 'A' + 7) % 26) + 'A';
16 }
17 }
18 }
19 }
20 void decoder(){
21 for (char& c : text) {
22 if (isalpha(c)) {
23 if (islower(c)) {
24 c = ((c - 'a' - 7) % 26) + 'a';
25 } else {
26 c = ((c - 'A' - 7) % 26) + 'A';
27 }
28 }
29 }
30 }
31 };
32 public:
33 TextCoder(string &str): text{str} {};
34 TextCoder(const TextCoder &t): text{t.text} {};
35 string get_ciphertext() {
36 encoder();
37 return text;
38 }
39 string get_deciphertext() {
40 decoder();
41 return text;
42 }
43 };
View Code
task5.cpp：
1 #include "textcoder.hpp"
2 #include <iostream>
3 #include <string>
4
5 void test() {
6 using namespace std;
7
8 string text, encoded_text, decoded_text;
9
10 cout << "输入英文文本: ";
11 while (getline(cin, text)) {
12 encoded_text = TextCoder(text).get_ciphertext(); // 这里使用的是临时无名对象
13 cout << "加密后英文文本:\t" << encoded_text << endl;
14
15 decoded_text = TextCoder(encoded_text).get_deciphertext(); // 这里使用的是临时无名对象
16 cout << "解密后英文文本:\t" << decoded_text << endl;
17 cout << "\n输入英文文本: ";
18 }
19 }
20
21 int main() {
22 test();
23 }
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运行测试结果：
task6.cpp源码
task6.cpp：
1 #include<iostream>
2 #include<string>
3 #include<vector>
4 #include "info.hpp"
5
6 const int capacity = 100;
7
8
9 int main()
10 {
11 vector<Info> audience_info_list;
12
13 cout << "录入信息：" << endl;
14 cout << endl;
15 cout << "昵称 联系方式(邮箱/手机号) 所在城市 预定参加人数 " << endl;
16 char choice;
17 int sum=0;
18 string nickname, contact, city;
19 int n;
20 while(cin >> nickname >> contact >> city >> n)
21 {
22 sum+=n;
23 if(sum > capacity)
24 {
25 sum-=n;
26 cout << "对不起，只剩" << capacity-sum << "个位置" << endl;
27 cout << "1.输入u，更新（update）预定信息" << endl
28 << "2.输入q, 退出预定" << endl
29 <<"你的选择: ";
30 cin >> choice;
31
32 if(choice=='u')
33 {
34 cin >> nickname >> contact >> city >> n;
35 Info a(nickname,contact,city,n);
36 audience_info_list.push_back(a);
37 sum+=n;
38 }
39 else
40 break;
41 }
42 else audience_info_list.push_back(Info(nickname, contact, city, n));
43 }
44 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;
45 for(auto &Info:audience_info_list)
46 {
47 Info.print();
48 }
49 }
View Code
info.hpp:
1 #include <iostream>
2
3 using namespace std;
4
5 class Info {
6 private:
7 string nickname;
8 string contact;
9 string city;
10 int n;
11
12 public:
13 Info(string nickname, string contact, string city, int n) : nickname{nickname}, contact{contact}, city{city}, n{n} {};
14 print() {
15 cout << "昵称： " << nickname << endl;
16 cout << "联系方式：" << contact << endl;
17 cout << "所在城市: " << city << endl;
18 cout << "预定人数； " << n <<endl;
19 }
20 };
View Code
运行测试结果：
标签：std,string,c++,实验,cpp,using,include,模板,cout From： https://www.cnblogs.com/xiaochengli/p/17858935.html