任务1:

task.cpp:

 1 #include <iostream>
 2 #include <string>
 3 #include <vector>
 4 #include <algorithm>
 5 
 6 using namespace std;
 7 
 8 // 声明
 9 // 模板函数声明
10 template<typename T>
11 void output(const T &c);
12 
13 // 普通函数声明
14 void test1();
15 void test2();
16 void test3();
17 
18 int main() {
19     cout << "测试1: \n";
20     test1();
21 
22     cout << "\n测试2: \n";
23     test2();
24 
25     cout << "\n测试3: \n";
26     test3();
27 }
28 
29 // 函数实现
30 // 输出容器对象c中的元素
31 template <typename T>
32 void output(const T &c) {
33     for(auto &i: c)
34         cout << i << " ";
35     cout << endl;
36 }
37 
38 // 测试1
39 // 组合使用算法库、迭代器、string反转字符串
40 void test1() {
41     string s0{"0123456789"};
42     cout << "s0 = " << s0 << endl;
43 
44     string s1{s0};
45     reverse(s1.begin(), s1.end());  // 反转指定迭代器区间的元素
46     cout << "s1 = " << s1 << endl;
47 
48     string s2{s0};
49     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
50     cout << "s2 = " << s2 << endl;
51 }
52 
53 // 测试2
54 // 组合使用算法库、迭代器、vector反转动态数组对象vector内数据
55 void test2() {
56     vector<int> v0{2, 0, 4, 9};
57     cout << "v0: ";
58     output(v0);
59 
60     vector<int> v1{v0};
61     reverse(v1.begin(), v1.end());
62     cout << "v1: ";
63     output(v1);
64 
65     vector<int> v2{v0};
66     reverse_copy(v0.begin(), v0.end(), v2.begin());
67     cout << "v2: ";
68     output(v2);
69 }
70 
71 // 测试3
72 // 组合使用算法库、迭代器、vector实现元素旋转移位
73 void test3() {
74     vector<int> v0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
75     cout << "v0: ";
76     output(v0);
77 
78     vector<int> v1{v0};
79     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
80     cout << "v1: ";
81     output(v1);
82 
83     vector<int> v2{v0};
84     rotate(v2.begin(), v2.begin()+2, v2.end());
85     cout << "v2: ";
86     output(v2);
87 
88     vector<int> v3{v0};
89     rotate(v3.begin(), v3.end()-1, v3.end());
90     cout << "v3: ";
91     output(v3);
92 
93     vector<int> v4{v0};
94     rotate(v4.begin(), v4.end()-2, v4.end());
95     cout << "v4: ";
96     output(v4);
97 }

 

代码运行结果:

 

 

 

任务2:

task.cpp:

 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 }

 

 

代码运行结果:

 

 

任务3:

task.cpp:

 1 #include <iostream>
 2 #include <string>
 3 #include <algorithm>
 4 
 5 
 6 bool is_palindrome(std::string s)
 7 {
 8    int left=0,right=s.length()-1;
 9    while(left<right)
10    {
11        if(s[left]!=s[right])
12        {
13     
14        return false;
15 }
16    left++;
17    right--;
18 }
19 return true;
20 }
21 
22 int main() {
23   using namespace std; 
24     string s;
25 
26     while(cin >> s)  // 多组输入,直到按下Ctrl+Z后结束测试
27         cout << boolalpha << is_palindrome(s) << endl;
28         return 0;
29 }
30 
31 // 函数is_palindrom定义
32 // 待补足
33 // ×××

 

 

 

代码运行结果:

 

 

任务4:

task.cpp:

 1 #include <iostream>
 2 #include <string>
 3 #include <algorithm>
 4 
 5 std::string dec2n(int x, int n = 2)
 6 {
 7     if(x==0) return "0";
 8     std::string result;
 9     const std::string digits="0123456789ABCDEF";
10     while(x>0)
11     {
12         result+=digits[x%n];
13         x/=n;
14     }
15     reverse(result.begin(),result.end());
16     return result;
17 }
18 
19 int main() {
20     using namespace std;
21 
22     int x;
23     while(cin >> x) {
24         cout << "十进制: " << x << endl;
25         cout << "二进制: " << dec2n(x) << endl;
26         cout << "八进制: " << dec2n(x, 8) << endl;
27         cout << "十六进制: " << dec2n(x, 16) << endl << endl;
28     }
29 }

 

 

代码运行结果:

 

 

任务5:

 

task.cpp:

 1 #include <iostream>
 2 using namespace std;
 3 
 4 int main() {
 5     cout << "  ";
 6     for (char c = 'a'; c <= 'z'; ++c) {
 7         cout << c << " ";
 8     }
 9     cout << endl;
10 
11 
12     for (int i = 0; i < 26; ++i) {
13         cout << i + 1 << " ";
14         for (int j = 0; j < 26; ++j) {
15  
16             char c = 'B' + (i + j) % 26;
17             if (c > 'Z') {
18                 c -= 26; 
19             }
20             cout << c << " ";
21         }
22         cout << endl;
23     }
24 
25     return 0;
26 }

 

 

 

 

代码运行结果:

 

 

任务6:

task.cpp:

 1 #include <iostream>
 2 #include <cstdlib>
 3 #include <ctime>
 4 
 5 using namespace std;
 6 
 7 int main() {
 8     srand(time(0)); 
 9     int a, b, user_answer, correct_answer;
10     char op;
11     int correct_count = 0;
12 
13     for (int i = 0; i < 10; ++i) {
14         a = rand() % 10 + 1;
15         b = rand() % 10 + 1;
16         op = "+-*/"[rand() % 4];
17 
18         if (op == '+') {
19             correct_answer = a + b;
20         } else if (op == '-') {
21             correct_answer = a - b;
22         } else if (op == '*') {
23             correct_answer = a * b;
24         } else if (op == '/') {
25             while (b == 0 || a % b != 0) { 
26                 a = rand() % 10 + 1;
27                 b = rand() % 10 + 1;
28             }
29             correct_answer = a / b;
30         }
31 
32         cout << a << " " << op << " " << b << " = ";
33         cin >> user_answer;
34 
35         if (user_answer == correct_answer) {
36             correct_count++;
37         }
38     }
39 
40     cout << "正确率: " << (correct_count * 10) << "%" << endl;
41 
42     return 0;
43 }

 

 

代码运行结果: