Task1
code1.cpp
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 }
View Code
result1:
Task2
code2.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
79 double avg1 = accumulate(v0.begin(), v0.end(), 0) / v0.size();
80 cout << "均值: " << fixed << setprecision(2) << avg1 << endl;
81 cout << endl;
82
83 vector<int> v1{ v0 };
84 cout << "v0: ";
85 output(v0);
86
87 sort(v1.begin(), v1.end());
88 double avg2 = accumulate(v1.begin() + 1, v1.end() - 1, 0) / (v1.size() - 2);
89 cout << "去掉最大值、最小值之后，均值: " << avg2 << endl;
90 }
View Code
result2:
Task3
code3.cpp
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4
5 bool is_palindrome(std::string s);
6
7 int main() {
8 using namespace std;
9 string s;
10 while (cin >> s) // 多组输入，直到按下Ctrl+Z后结束测试
11 cout << boolalpha << is_palindrome(s) << endl;
12 }
13
14 bool is_palindrome(std::string s) {
15 using namespace std;
16
17 string re_s{ s };
18 reverse_copy(s.begin(), s.end(), re_s.begin());
19
20 if (s == re_s)
21 return true;
22 else
23 return false;
24 }
result3:
Task4
code4.cpp
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4
5 std::string dec2n(int x, int n = 2);
6
7 int main() {
8 using namespace std;
9 int x;
10 while (cin >> x) {
11 cout << "十进制: " << x << endl;
12 cout << "二进制: " << dec2n(x, 2) << endl;
13 cout << "八进制: " << dec2n(x, 8) << endl;
14 cout << "十六进制: " << dec2n(x, 16) << endl << endl;
15 }
16 }
17
18 std::string dec2n(int x, int n) {
19 if (x == 0) return "0";
20
21 std::string res;
22 if (n == 2) {
23 while (x) {
24 res += (x % 2) + '0';
25 x /= 2;
26 }
27
28 reverse(res.begin(), res.end());
29 return res;
30 }
31
32 else if (n == 8) {
33 while (x) {
34 res += (x % 8) + '0';
35 x /= 8;
36 }
37
38 reverse(res.begin(), res.end());
39 return res;
40 }
41
42 else {
43 char Hex[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
44
45 while (x) {
46 res += Hex[x % 16];
47 x /= 16;
48 }
49
50 reverse(res.begin(), res.end());
51 return res;
52 }
53
54 }
result4:
Task5
code5.cpp
1 #include<iostream>
2 #include<iomanip>
3
4 using namespace std;
5
6 int main() {
7 int ch1{ 'a' };
8
9 cout << setw(4) << " ";
10 for (int i = 0; i < 26; ++i)
11 cout << setw(4) << static_cast<char>(ch1++);
12 cout << endl;
13
14 for (int num = 1; num <= 26; ++num) {
15 cout << setw(4) << num;
16 int begin = num + 'A';
17
18 for (int i = 0; i < 26; ++i) {
19 if (begin > 'Z') begin = begin % 90 + 64;
20 cout << setw(4) << static_cast<char>(begin++);
21 }
22 cout << endl;
23 }
24
25 return 0;
26 }
result5:
Task6
code6.cpp
1 #include<iostream>
2 #include<vector>
3 #include<ctime>
4 #include<cstdlib>
5 #include<algorithm>
6 #include<iomanip>
7
8 #define M 10
9 #define N 1
10
11 using namespace std;
12
13 template<typename T>
14 void print(const T& x) {
15 for (auto& i : x)
16 cout << setw(4) << i;
17 cout << endl;
18 }
19
20 class Quiz {
21 public:
22 Quiz(int num = 10) : quiz_num{ num } {}
23 ~Quiz() = default;
24
25 void generateQuiz();
26 void calculate();
27
28 private:
29 int quiz_num;
30 vector<int> operand1;
31 vector<int> operand2;
32 vector<int> operater;
33 int rand_int_10();
34 int rand_int_4();
35 };
36
37 void Quiz::generateQuiz() {
38 srand(static_cast<unsigned>(time(0)));
39
40 operand1.resize(quiz_num);
41 operand2.resize(quiz_num);
42 operater.resize(quiz_num);
43 generate(operand1.begin(), operand1.end(), [this]() { return rand_int_10(); });
44 generate(operand2.begin(), operand2.end(), [this]() { return rand_int_10(); });
45 generate(operater.begin(), operater.end(), [this]() { return rand_int_4(); });
46
47 for (int i = 0; i < quiz_num; ++i) {
48 if (operater.at(i) == 2 && operand1.at(i) < operand2.at(i))
49 swap(operand1.at(i), operand2.at(i));
50
51 if (operater.at(i) == 4 && operand1.at(i) < operand2.at(i))
52 swap(operand1.at(i), operand2.at(i));
53
54 if (operater.at(i) == 4)
55 while (operand1.at(i) % operand2.at(i) != 0)
56 operand2.at(i) = rand() % 10 + 1;
57 }
58
59 }
60
61 void Quiz::calculate() {
62 double rate = 0;
63 int ans;
64
65 for (int i = 0; i < quiz_num; ++i) {
66 int corrrct_ans;
67
68 cout << operand1.at(i) << " ";
69 switch (operater.at(i)) {
70 case 1:
71 cout << "+ ";
72 corrrct_ans = operand1.at(i) + operand2.at(i);
73 break;
74 case 2:
75 cout << "- ";
76 corrrct_ans = operand1.at(i) - operand2.at(i);
77 break;
78 case 3:
79 cout << "* ";
80 corrrct_ans = operand1.at(i) * operand2.at(i);
81 break;
82 case 4:
83 cout << "/ ";
84 corrrct_ans = operand1.at(i) / operand2.at(i);
85 break;
86 default:
87 cout << "error";
88 break;
89 }
90 cout << operand2.at(i) << " = ";
91
92 cin >> ans;
93
94 if (ans == corrrct_ans) rate++;
95 }
96 cout << "正确率: " << fixed << setprecision(2) << (rate / quiz_num) * 100 << "%";
97 }
98
99 int Quiz::rand_int_10() {
100 return rand() % (M - N + 1) + N;
101 }
102
103 int Quiz::rand_int_4() {
104 return rand() % (4 - 1 + 1) + 1;
105 }
106
107 int main() {
108 Quiz Q(10);
109 Q.generateQuiz();
110 Q.calculate();
111
112 return 0;
113 }
result6:
标签：begin,初体验,end,cout,int,编程,C++,v0,include From： https://www.cnblogs.com/nuist0415/p/18454424