task1:
1 // 现代C++标准库、算法库体验
2 // 本例用到以下内容:
3 // 1. 字符串string, 动态数组容器类vector、迭代器
4 // 2. 算法库：反转元素次序、旋转元素
5 // 3. 函数模板、const引用作为形参
6
7 #include <iostream>
8 #include <string>
9 #include <vector>
10 #include <algorithm>
11
12 using namespace std;
13
14 // 声明
15 // 模板函数声明
16 template<typename T>
17 void output(const T &c);
18
19 // 普通函数声明
20 void test1();
21 void test2();
22 void test3();
23
24 int main() {
25 cout << "测试1: \n";
26 test1();
27
28 cout << "\n测试2: \n";
29 test2();
30
31 cout << "\n测试3: \n";
32 test3();
33 }
34
35 // 函数实现
36 // 输出容器对象c中的元素
37 template <typename T>
38 void output(const T &c) {
39 for(auto &i: c)
40 cout << i << " ";
41 cout << endl;
42 }
43
44 // 测试1
45 // 组合使用算法库、迭代器、string反转字符串
46 void test1() {
47 string s0{"0123456789"};
48 cout << "s0 = " << s0 << endl;
49
50 string s1{s0};
51 reverse(s1.begin(), s1.end()); // 反转指定迭代器区间的元素
52 cout << "s1 = " << s1 << endl;
53
54 string s2{s0};
55 reverse_copy(s0.begin(), s0.end(), s2.begin()); // 将指定迭代区间的元素拷贝到指定迭代器开始的目标区间，并且在复制过程中反转次序
56 cout << "s2 = " << s2 << endl;
57 }
58
59 // 测试2
60 // 组合使用算法库、迭代器、vector反转动态数组对象vector内数据
61 void test2() {
62 vector<int> v0{2, 0, 4, 9};
63 cout << "v0: ";
64 output(v0);
65
66 vector<int> v1{v0};
67 reverse(v1.begin(), v1.end());
68 cout << "v1: ";
69 output(v1);
70
71 vector<int> v2{v0};
72 reverse_copy(v0.begin(), v0.end(), v2.begin());
73 cout << "v2: ";
74 output(v2);
75 }
76
77 // 测试3
78 // 组合使用算法库、迭代器、vector实现元素旋转移位
79 void test3() {
80 vector<int> v0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
81 cout << "v0: ";
82 output(v0);
83
84 vector<int> v1{v0};
85 rotate(v1.begin(), v1.begin()+1, v1.end()); // 旋转指定迭代器区间[v1.begin(), v1.end())之间的数据项，旋转后从迭代器v1.begin()+1位置的数据项开始
86 cout << "v1: ";
87 output(v1);
88
89 vector<int> v2{v0};
90 rotate(v2.begin(), v2.begin()+2, v2.end());
91 cout << "v2: ";
92 output(v2);
93
94 vector<int> v3{v0};
95 rotate(v3.begin(), v3.end()-1, v3.end());
96 cout << "v3: ";
97 output(v3);
98
99 vector<int> v4{v0};
100 rotate(v4.begin(), v4.end()-2, v4.end());
101 cout << "v4: ";
102 output(v4);
103 }
实验结果截图：
task2:
1 #include <iostream>
2 #include <vector>
3 #include <string>
4 #include <algorithm>
5 #include <numeric>
6 #include <iomanip>
7
8 using namespace std;
9
10 // 函数声明
11 // 模板函数声明
12 template<typename T>
13 void output(const T &c);
14
15 // 普通函数声明
16 int rand_int_100();
17 void test1();
18 void test2();
19
20 int main() {
21 cout << "测试1: \n";
22 test1();
23
24 cout << "\n测试2: \n";
25 test2();
26 }
27
28 // 函数实现
29 // 输出容器对象c中的元素
30 template <typename T>
31 void output(const T &c) {
32 for(auto &i: c)
33 cout << i << " ";
34 cout << endl;
35 }
36
37 // 返回[0, 100]区间内的一个随机整数
38 int rand_int_100() {
39 return rand() % 101;
40 }
41
42 // 测试1
43 // 对容器类对象指定迭代器区间进行赋值、排序
44 void test1() {
45 vector<int> v0(10); // 创建一个动态数组对象v0, 对象大小为10
46 generate(v0.begin(), v0.end(), rand_int_100); // 产生[0, 100]之间的随机整数赋值给指定迭代器区间[v0.begin(), v0.end())内的每个数据项
47 cout << "v0: ";
48 output(v0);
49
50 vector<int> v1{v0};
51 sort(v1.begin(), v1.end()); // 对指定迭代器区间[v1.begin(), v1.end())内数据项进行升序排序
52 cout << "v1: ";
53 output(v1);
54
55 vector<int> v2{v0};
56 sort(v2.begin()+1, v2.end()-1); // 对指定迭代器区间[v1.begin()+1, v1.end()-1)内数据项进行升序排序
57 cout << "v2: ";
58 output(v2);
59 }
60
61 // 测试2
62 // 对容器类对象指定迭代器区间进行赋值、计算最大值/最小值/均值
63 void test2() {
64 vector<int> v0(10);
65 generate(v0.begin(), v0.end(), rand_int_100);
66 cout << "v0: ";
67 output(v0);
68
69 auto iter1 = min_element(v0.begin(), v0.end());
70 cout << "最小值: " << *iter1 << endl;
71
72 auto iter2 = max_element(v0.begin(), v0.end());
73 cout << "最大值: " << *iter2 << endl;
74
75 auto ans = minmax_element(v0.begin(), v0.end());
76 cout << "最小值: " << *(ans.first) << endl;
77 cout << "最大值: " << *(ans.second) << endl;
78 double avg1 = accumulate(v0.begin(), v0.end(), 0)/v0.size();
79 cout << "均值: " << fixed << setprecision(2) << avg1 << endl;
80
81 cout << endl;
82
83 vector<int> v1{v0};
84 cout << "v0: ";
85 output(v0);
86 sort(v1.begin(), v1.end());
87 double avg2 = accumulate(v1.begin()+1, v1.end()-1, 0)/(v1.size()-2);
88 cout << "去掉最大值、最小值之后，均值: " << avg2 << endl;
89 }
实验结果截图：
task3:
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4
5 bool is_palindrome(std::string s){
6 std::string reversed_s=s;
7 std::reverse(reversed_s.begin(),reversed_s.end());
8 if(s==reversed_s){
9 return true;
10 } else{
11 return false;
12 }
13 }
14
15 int main() {
16 using namespace std;
17 string s;
18
19 while(cin >> s) // 多组输入，直到按下Ctrl+Z后结束测试
20 cout << boolalpha << is_palindrome(s) << endl;
21 }
实验结果截图：
task4:
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4
5 std::string dec2n(int x, int n = 2)
6 {
7 std::string result;
8 while(x>0)
9 {
10 int remainder=x%n;
11 if(remainder<10)
12 {
13 result+=remainder+'0';
14 }
15 else
16 {
17 result+=remainder-10+'A';
18 }
19 x/=n;
20 }
21 std::reverse(result.begin(),result.end());
22 return result;
23 }
24
25 int main() {
26 using namespace std;
27
28 int x;
29 while(cin >> x) {
30 cout << "十进制: " << x << endl;
31 cout << "二进制: " << dec2n(x) << endl;
32 cout << "八进制: " << dec2n(x, 8) << endl;
33 cout << "十六进制: " << dec2n(x, 16) << endl << endl;
34 }
35 }
实验结果截图：
task5:
1 #include<iostream>
2 int main()
3 {
4 for(int i=1;i<=26;i++)
5 {
6 std::string encrypted_letters="";
7 for(char letter='A';letter<='Z';letter++)
8 {
9 int new_index=((letter-'A'+i)%26);
10 encrypted_letters+=(char)('A'+new_index);
11 }
12 std::cout<<encrypted_letters<<std::endl;
13 }
14 return 0;
15 }
实验结果截图：
task6:
1 #include <iostream>
2 #include <cstdlib>
3 #include <ctime>
4 #include <iomanip>
5
6 int generateRandomNumber(int min, int max) {
7 return rand() % (max - min + 1) + min;
8 }
9
10 void generateRandomOperation(int &num1, int &num2, char &op) {
11 int choice = rand() % 4;
12 switch (choice) {
13 case 0:
14 num1 = generateRandomNumber(1, 10);
15 num2 = generateRandomNumber(1, 10);
16 op = '+';
17 break;
18 case 1:
19 num1 = generateRandomNumber(2, 10);
20 num2 = generateRandomNumber(1, num1 - 1);
21 op = '-';
22 break;
23 case 2:
24 num1 = generateRandomNumber(1, 10);
25 num2 = generateRandomNumber(1, 10);
26 op = '*';
27 break;
28 case 3:
29 num1 = generateRandomNumber(1, 10);
30 num2 = generateRandomNumber(1, 10);
31 while (num1 % num2!= 0) {
32 num2 = generateRandomNumber(1, 10);
33 }
34 op = '/';
35 break;
36 }
37 }
38
39 int calculateResult(int num1, int num2, char op) {
40 switch (op) {
41 case '+':
42 return num1 + num2;
43 case '-':
44 return num1 - num2;
45 case '*':
46 return num1 * num2;
47 case '/':
48 return num1 / num2;
49 }
50 return 0;
51 }
52
53 int main() {
54 srand(static_cast<unsigned int>(time(0)));
55 int correctCount = 0;
56 int totalCount = 10;
57
58 for (int i = 0; i < totalCount; ++i) {
59 int num1, num2;
60 char op;
61 generateRandomOperation(num1, num2, op);
62
63 std::cout << num1 << " " << op << " " << num2 << " = ";
64 int userAnswer;
65 std::cin >> userAnswer;
66
67 int correctAnswer = calculateResult(num1, num2, op);
68 if (userAnswer == correctAnswer) {
69 correctCount++;
70 }
71 }
72
73 double accuracy = (static_cast<double>(correctCount) / totalCount) * 100.0;
74 std::cout << "正确率：" << std::fixed << std::setprecision(2) << accuracy << "%" << std::endl;
75
76 return 0;
77 }
实验结果截图：
标签：begin,cout,int,v0,v1,实验,oop,include From： https://www.cnblogs.com/g055140/p/18453544