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实验3 数组、指针与现代C++标准库

时间：2022-10-30 03:44:05浏览次数：44  
标签：std cout int C++ 数组 using include string 指针

task1

代码：

 1 #include <iostream>
 2 
 3 using std::cout;
 4 using std::endl;
 5 
 6 // 绫籄鐨勫畾涔?
 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 // 绫籅鐨勫畾涔?
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 int main() {
25     A a(3, 4);
26     a.show();
27 
28     B b(3.2, 5.6);
29     b.show();
30 }
 1 #include <iostream>
 2 #include <string>
 3 
 4 using std::cout;
 5 using std::endl;
 6 
 7 // 瀹氫箟绫绘ā鏉縓
 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 int main() {
18     X<int> x1(3, 4);
19     x1.show();
20 
21     X<double> x2(3.2, 5.6);
22     x2.show();
23 
24     X<std::string> x3("hello", "c plus plus");
25     x3.show();
26 }

 

测试结果：

 

 

 

 

 

 

task2

代码：

 1 #include <iostream>
 2 #include <string>
 3 
 4 int main() {
 5     using namespace std;
 6 
 7     string s1, s2;
 8     s1 = "nuist";                                 // 璧嬪€?
 9     s1[0] = 'N';                                  // 鏀寔閫氳繃[]鍜岀储寮曟柟寮忚闂?
10     s1.at(1) = 'U';                               // 鏀寔閫氳繃xx.at()鏂规硶璁块棶
11     cout << boolalpha << (s1 == "nuist") << endl; // 瀛楃涓叉瘮杈?
12     cout << s1.length() << endl;                  // 瀛楃涓查暱搴?
13     cout << s1.size() << endl;                    // 瀛楃涓查暱搴?
14     s2 = s1 + ", 2050";                           // 瀛楃涓茶繛鎺?
15     cout << s2 << endl;
16 
17     string email{"[email protected]"};
18     auto pos = email.find("@"); // 鏌ユ壘瀛愪覆"@"绗竴娆″嚭鐜扮殑绱㈠紩浣嶇疆锛屽鏋滃け璐ワ紝杩斿洖string::npos
19     if (pos == string::npos)
20         cout << "illegal email address";
21     else {
22         auto s1 = email.substr(0, pos);  // 鍙栧瓙涓? 浠庣储寮? ~ pos-1
23         auto s2 = email.substr(pos + 1); // 鍙栧瓙涓诧紝浠巔os+1鍒版湯灏?
24         cout << s1 << endl;
25         cout << s2 << endl;
26     }
27 
28     string phone{"15216982937"};
29     cout << phone.replace(3, 5, string(5, '*')) << endl; // 鎶婁粠绱㈠紩浣嶇疆涓?寮€濮嬬殑杩炵画5涓瓧绗︽浛鎹㈡垚*
30 
31     string s3{"cosmos"}, s4{"galaxy"};
32     cout << "s3: " + s3 + " s4: " + s4 << endl;
33     s3.swap(s4); // 浜ゆ崲
34     cout << "s3: " + s3 + " s4: " + s4 << endl;
35 
36     string s5{"abc"};
37     const char *pstr = s5.c_str(); // 鏂规硶c_str()鎶妔tring绫诲瓧绗︿覆缁勮浆鎹㈡垚C椋庢牸鐨勫瓧绗︿覆
38     cout << pstr << endl;
39 
40     string s6{"12306"};
41     int x1 = stoi(s6); // 鎶妔tring杞崲鎴恑nt
42     cout << x1 << endl;
43 
44     int x2 = 12306;
45     string s7 = to_string(x2);  // 鎶奿nt杞崲鎴恠tring
46     cout << s7 << endl;
47 
48     double x3 = 123.06;
49     string s8 = to_string(x3); // 鎶奷ouble杞崲鎴恠tring
50     cout << s8 << endl;
51 }
 1 #include <iostream>
 2 #include <string>
 3 #include <limits>
 4 
 5 int main() {
 6     using namespace std;
 7 
 8     const int n = 10;
 9     string prompt = string(n, '*') + "Enter a string: " + string(n, '*') + '\n';
10   
11     cout << prompt;
12     string s1;
13     cin >> s1;  // 浠庤緭鍏ユ祦涓彁鍙栧瓧绗︿覆缁檚1锛岀鍒扮┖鏍笺€佸洖杞︺€乀ab閿嵆缁撴潫
14     cout << "s1: " << s1 << endl;
15     cin.ignore(numeric_limits<streamsize>::max(), '\n');  // 娓呯┖杈撳叆缂撳啿鍖?
16 
17     cout << prompt;
18     getline(cin, s1);  // 浠庤緭鍏ユ祦涓彁鍙栦竴琛屽瓧绗︿覆缁檚1锛岀洿鍒版崲琛?
19     cout << "s1: " << s1 << endl;
20 
21     string s2, s3;
22     cout << prompt;
23     getline(cin, s2, ' ');  // 浠庤緭鍏ユ祦涓彁鍙栧瓧绗︿覆缁檚2锛岀洿鍒版寚瀹氬垎闅旂绌烘牸
24     getline(cin, s3);
25     cout << "s2: " << s2 << endl;
26     cout << "s3: " << s3 << endl;
27 }
 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     // 閲嶅褰曞叆瀛楃涓诧紝灏嗗皬鍐欏瓧绗﹁浆鎹㈡垚澶у啓锛岀洿鍒版寜涓婥trl+Z
11     while( getline(cin, s) ) {
12         for(auto &ch: s)
13             ch = toupper(ch);
14         cout << s << "\n";
15     }
16 }
 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 }

 

测试结果：

 

 

 

 

 

 

 

 

 

 

 

 

task3

代码：

 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;                // 鍒涘缓涓€涓獀ector瀵硅薄v1, 鏈寚瀹氬ぇ灏? 鍏冪礌鏄痠nt鍨? 鏈垵濮嬪寲
16     vector<int> v2(5);             // 鍒涘缓涓€涓獀ector瀵硅薄v2, 鍖呭惈5涓厓绱狅紝鍏冪礌鏄痠nt鍨嬶紝鍒濆鍊兼槸榛樿鍊?
17     vector<int> v3(5, 42);         // 鍒涘缓涓€涓獀ector瀵硅薄v3, 鍖呭惈5涓厓绱狅紝鍏冪礌鏄痠nt鍨嬶紝鎸囧畾鍒濆鍊兼槸42
18     vector<int> v4{1, 9, 8, 4}; // 鍒涘缓涓€涓獀ector瀵硅薄v4, 鍏冪礌鏄痠nt鍨嬶紝浣跨敤鍒濆鍖栧垪琛ㄦ柟寮?
19     vector<int> v5{v4};            // 鍒涘缓涓€涓獀ector瀵硅薄v5, 浣跨敤宸茬粡瀛樺湪鐨勫璞4鍒涘缓
20 
21     output(v2);
22     output(v3);
23     output(v4);
24     output(v5);
25 }
 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 }

 

测试结果：

 

 

 

 

 

 

task4

代码：

 1 #include <iostream>
 2 #include <vector>
 3 #include <array>
 4 #include <string>
 5 #include <algorithm>
 6 
 7 using namespace std;
 8 
 9 // 鍑芥暟妯℃澘
10 // 閫氳繃绱㈠紩鏂瑰紡杈撳嚭瀵硅薄鍊?
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 // 鍑芥暟妯℃澘
19 // 閫氳繃杩唬鍣ㄦ柟寮忚緭鍑哄璞″€?
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 // 鍑芥暟妯℃澘
28 // 閫氳繃auto for鏂瑰紡杈撳嚭瀵硅薄鍊?
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 // 娴嬭瘯string绫诲璞?
37 void test1() {
38     string s1{"cplus"};
39 
40     output1(s1);
41 
42     reverse(s1.begin(), s1.end());  // 瀵瑰璞1涓殑鏁版嵁椤硅繘琛岀炕杞?
43     output2(s1);
44 
45     sort(s1.begin(), s1.end());   // 瀵瑰璞1涓殑鏁版嵁椤规帓搴?榛樿鍗囧簭)
46     output3(s1);
47 }
48 
49 // 娴嬭瘯array<int>绫诲璞?
50 void test2() {
51     array< array<int, 4>, 3> x{1, 9, 8, 4, 2, 0, 2, 2, 2, 0, 4, 9 };
52 
53     output1( x.at(0) );
54     output2( x.at(1) );
55     output3( x.at(2) );
56 }
57 
58 // 娴嬭瘯vector<string>绫诲璞?
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>());  // 瀵箆1瀵硅薄涓殑瀛楃涓叉寜闄嶅簭鎺掑簭
68     output2(v1);
69 
70     reverse(v1.begin(), v1.end());  // 瀵箆1瀵硅薄涓殑瀛楃涓茬炕杞?
71     output3(v1);
72 }
73 
74 int main() {
75     cout << "test1: " << endl;
76     test1();
77 
78     cout << "test2: " << endl;
79     test2();
80 
81     cout << "test3: " << endl;
82     test3();
83 }

 

测试结果：

 

 

 

task5

代码：

 1 #include "info.hpp"
 2 #include<iostream>
 3 #include<cstring>
 4 #include<vector>
 5 using namespace std;
 6 int main()
 7 {
 8     const int capacity=200;
 9     vector<Info> audience_info_list;
10     string a,b,c;
11     int d;
12     int t=0;
13     while((cin>>a>>b>>c>>d)&&d!=0&&t<=capacity)
14     {
15         t+=d;
16         audience_info_list.push_back(Info(a,b,c,d));
17     }
18     for(int i=0;i<audience_info_list.size();i++)
19     audience_info_list[i].print();
20     while(cin>>a>>b>>c>>d)
21     {
22         if(d+t>capacity)
23         {
24             cout<<"位置不够"<<endl;
25         }
26         else
27         {
28             cout<<"位置够"<<endl;
29         }
30         t+=d;
31         char q=' ';
32             cout<<"输入q退出u更新"<<endl;
33             cin>>q;
34             if(q=='q') break;
35             if(q=='u'&&t<=capacity)  audience_info_list.push_back(Info(a,b,c,d));
36     }
37     for(int i=0;i<audience_info_list.size();i++)
38     audience_info_list[i].print();
39     return 0;
40 }
 1 #include<cstring>
 2 #include<iostream>
 3 using namespace std;
 4 class Info
 5 {
 6     public:
 7         Info(string a="",string b="",string c="",int d=0)
 8         {
 9             nickname=a;
10             contact=b;
11             city=c;
12             n=d;
13         }
14         void print()
15         {
16             cout<<"昵称:"<<nickname<<endl;
17             cout<<"联系方式:"<<contact<<endl;
18             cout<<"所在城市:"<<city<<endl; 
19             cout<<"预定人数:"<<n<<endl;
20         }
21     private:
22         string nickname,contact,city;
23         int n;
24  } ;

 

测试结果：

 

 

 

task6

代码：

#include "textcoder.hpp"
#include <iostream>
#include <string>

void test() {
    using namespace std;

    string text, encoded_text, decoded_text;

    cout << "输入: ";
    while (getline(cin, text)) {
        encoded_text = TextCoder(text).get_ciphertext();  // 杩欓噷浣跨敤鐨勬槸涓存椂鏃犲悕瀵硅薄
        cout << "加密\t" << encoded_text << endl;

        decoded_text = TextCoder(encoded_text).get_deciphertext(); // 杩欓噷浣跨敤鐨勬槸涓存椂鏃犲悕瀵硅薄
        cout << "解密\t" << decoded_text << endl;
        cout << "输入： ";
    }
}

int main() {  
    test(); 
}
 1 #include<cstring>
 2 #include<iostream>
 3 using namespace std;
 4 class TextCoder
 5 {
 6     public:
 7         TextCoder(string a)
 8         {
 9             text=a;
10         }
11         string get_ciphertext(){
12             encoder();
13             return text;
14         }
15         string get_deciphertext(){
16             decoder();
17             return text;
18         }
19     private:
20         void encoder()
21         {
22             for(int i=0;i<text.size();i++)
23             if((text[i]>='a'&&text[i]<='z')||(text[i]>='A'&&text[i]<='Z'))
24             {
25                 text[i]+=5;
26                 if(text[i]>'z'||(text[i]<'a'&&text[i]>'Z')) text[i]-=26;
27             }
28         }
29         void decoder()
30         {
31             for(int i=0;i<text.size();i++)
32             if((text[i]>='a'&&text[i]<='z')||(text[i]>='A'&&text[i]<='Z'))
33             {
34                 text[i]-=5;
35                 if(text[i]<'A'||(text[i]<'a'&&text[i]>'Z')) text[i]+=26;
36             }
37         }
38         string text;
39  };

 

测试结果：

 

标签：std,cout,int,C++,数组,using,include,string,指针
From： https://www.cnblogs.com/git-porn-hub/p/16840409.html

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