1 #include <iostream>
2
3 using std::cout;
4 using std::endl;
5
6 class A{
7 public:
8 A(int x0, int y0): x{ x0 }, y{ y0 } {}
9 void show() const { cout << x << ", " << y << endl; }
10 private:
11 int x, y;
12 };
13
14 class B{
15 public:
16 B(double x0, double y0): x{ x0 }, y{ y0 } {}
17 void show() const { cout << x << ", " << y << endl;}
18 private:
19 double x, y;
20 };
21
22 void test() {
23 cout << "测试类A: " << endl;
24 A a(3, 4);
25 a.show();
26
27 cout << "\n测试类B: " << endl;
28 B b(3.2, 5.6);
29 b.show();
30 }
31
32 int main() {
33 test();
34 }
task1_1.cpp
1 #include <iostream>
2 #include <string>
3
4 using std::cout;
5 using std::endl;
6
7 template<typename T>
8 class X{
9 public:
10 X(T x0, T y0): x{x0}, y{y0} {}
11 void show() const { cout << x << ", " << y << endl;}
12 private:
13 T x, y;
14 };
15
16 void test() {
17 cout << "测试1: 模板类抽象类型T用int实例化" << endl;
18 X<int> x1(3, 4);
19 x1.show();
20
21 cout << "\n测试2: 模板类抽象类型T用double实例化" << endl;
22 X<double> x2(3.2, 5.6);
23 x2.show();
24
25 cout << "\n测试3: 模板类抽象类型T用标准库中的string实例化" << endl;
26 X<std::string> x3("hello", "c plus plus");
27 x3.show();
28 }
29
30 int main() {
31 test();
32 }
task1_2.cpp
1 #include <iostream>
2 #include <string>
3 #include <limits>
4
5 using namespace std;
6
7 int main() {
8
9 const int n = 10;
10 string prompt = string(n, '*') + "Enter a string: " + string(n, '*') + '\n';
11
12 cout << "测试1:";
13 cout << prompt;
14 string s1;
15 cin >> s1;
16 cout << "s1: " << s1 << endl;
17 cin.ignore(numeric_limits<streamsize>::max(), '\n');
18
19 cout << "\n测试2:";
20 cout << prompt;
21 getline(cin, s1);
22 cout << "s1: " << s1 << endl;
23
24 cout << "\n测试3:";
25 string s2, s3;
26 cout << prompt;
27 getline(cin, s2, ' ');
28 getline(cin, s3);
29 cout << "s2: " << s2 << endl;
30 cout << "s3: " << s3 << endl;
31 }
task2_1.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
11 while( getline(cin, s) ) {
12 for(auto &ch: s)
13 ch = toupper(ch);
14 cout << s << "\n";
15 }
16 }
task2_2.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;
}
task2_3.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;
}
task2_4.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};
cout << "v2: ";
output(v2);
cout << "v3: ";
output(v3);
cout << "v4: ";
output(v4);
cout << "v5: ";
output(v5);
}
task3_1.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);
}
task3_2.cpp
1 #include <iostream>
2 #include <vector>
3 #include <array>
4 #include <string>
5 #include <algorithm>
6
7 using namespace std;
8
9 template<typename T>
10 void output1(const T &obj) {
11 for(auto i = 0; i < obj.size(); ++i)
12 cout << obj.at(i) << ", ";
13 cout << "\b\b \n";
14 }
15
16 template<typename T>
17 void output2(const T &obj) {
18 for(auto p = obj.cbegin(); p != obj.cend(); ++p)
19 cout << *p << ", ";
20 cout << "\b\b \n";
21 }
22
23 template<typename T>
24 void output3(const T &obj) {
25 for(auto &item: obj)
26 cout << item << ", ";
27 cout << "\b\b \n";
28 }
29
30 void test1() {
31 string s1{"cplus"};
32
33 output1(s1);
34
35 reverse(s1.begin(), s1.end());
36 output2(s1);
37
38 sort(s1.begin(), s1.end());
39 output3(s1);
40 }
41
42 void test2() {
43 array< array<int, 4>, 3> x{1, 9, 8, 4, 2, 0, 2, 3, 2, 0, 4, 9 };
44
45 output1( x.at(0) );
46 output2( x.at(1) );
47 output3( x.at(2) );
48 }
49
50 void test3() {
51 vector<string> v1 {"Sheldon", "Leonard", "Howard", "Raj"};
52
53 v1.push_back("Penny");
54 v1.push_back("Amy");
55
56 output1(v1);
57
58 sort(v1.begin(), v1.end(), std::greater<string>());
59 output2(v1);
60
61 reverse(v1.begin(), v1.end());
62 output3(v1);
63 }
64
65 int main() {
66 cout << "测试1: " << endl;
67 test1();
68
69 cout << "测试2: " << endl;
70 test2();
71
72 cout << "测试3: " << endl;
73 test3();
74 }
task4.cpp
#pragma once
#include<iostream>
#include<string>
#include <iomanip>
using namespace std;
class Info{
public:
Info(string nickname0, string contact0, string city0, int n0);
~Info()=default;
void print() const;
private:
string nickname,contact,city;
int n;
};
Info::Info(string nickname0, string contact0, string city0, int n0)
{
nickname = nickname0;
contact = contact0;
city = city0;
n=n0;
}
void Info::print() const
{
cout << "昵称: " << nickname << endl;
cout << "联系方式: " << contact << endl;
cout << "所在城市: " << city << endl;
cout << "预定参加人数: " << n << endl;
}
Info.hpp
1 #include "Info.hpp"
2 #include<iostream>
3 #include<string>
4 #include <vector>
5
6 using namespace std;
7
8 int main()
9 {
10 const int capacity=100;
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 name, contact, city;
19 int n;
20 while(cin >> name >> contact >> city >> n)
21 {
22 sum+=n;
23
24 if(sum > capacity)
25 {
26 sum-=n;
27 cout << "对不起，只剩" << capacity-sum << "个位置" << endl;
28 cout << "1.输入u，更新（update）预定信息" << endl
29 << "2.输入q, 退出预定" << endl
30 <<"你的选择: ";
31 cin >> choice;
32
33 if(choice=='u')
34 {
35 cin >> name >> contact >> city >> n;
36 Info a(name,contact,city,n);
37 audience_info_list.push_back(a);
38 sum+=n;
39 }
40 else
41 break;
42 }
43 else audience_info_list.push_back(Info(name, contact, city, n));
44 }
45 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;
46 for(auto &Info:audience_info_list)
47 {
48 Info.print();
49 }
50 }
task6.cpp
标签：std,cout,int,C++,实验,using,include,模板,string From： https://www.cnblogs.com/zs202183290495/p/17868943.html