任务一
源代码
1 #include<iostream>
2 #include<string>
3 #include<vector>
4 #include<algorithm>
5
6 using namespace std;
7
8 template<typename T>
9 void output(const T& c);
10
11 void test1();
12 void test2();
13 void test3();
14
15 int main() {
16 cout << "测试1: \n";
17 test1();
18
19 cout << "\n测试2: \n";
20 test2();
21
22 cout << "\n测试3: \n";
23 test3();
24 }
25
26
27 //输出c中的元素，c容器对象
28 template<typename T>
29 void output(const T& c) {
30 for (auto& i : c)
31 cout << i << " ";
32 cout << endl;
33 }
34
35
36
37 //组合使用算法库，迭代器，string反转字符串
38 void test1() {
39 string s0{ "0123456789" };
40 cout << "s0=" << s0 << endl;
41
42 string s1{ s0 };
43 reverse(s1.begin(), s1.end());
44 cout << "s1 = " << s1 << endl;
45
46 string s2{ s0 };
47 reverse_copy(s0.begin(), s0.end(), s2.begin());
48 cout << "s2 = " << s2 << endl;
49 }
50
51
52
53 //vector反转动态数组
54 void test2() {
55 vector<int>v0{ 2,0,4,9 };
56 cout << "v0: ";
57 output(v0);
58
59 vector<int>v1{ v0 };
60 reverse(v1.begin(), v1.end());
61 cout << "v1:";
62 output(v1);
63
64 vector<int>v2{ v0 };
65 reverse_copy(v0.begin(), v0.end(), v2.begin());
66 cout << "v2:";
67 output(v2);
68 }
69
70
71 //vector元素旋转移位
72 void test3() {
73 vector<int>v0{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
74 cout << "v0:";
75 output(v0);
76
77 vector<int>v1{ v0 };
78 rotate(v1.begin(), v1.begin() + 1, v1.end());
79 cout << "v1:";
80 output(v1);
81
82 vector<int> v2{ v0 };
83 rotate(v2.begin(), v2.begin() + 2, v2.end());
84 cout << "v2: ";
85 output(v2);
86
87 vector<int> v3{ v0 };
88 rotate(v3.begin(), v3.end() - 1, v3.end());
89 cout << "v3: ";
90 output(v3);
91
92 vector<int> v4{ v0 };
93 rotate(v4.begin(), v4.end() - 2, v4.end());
94 cout << "v4: ";
95 output(v4);
96
97 }
View Code
运行结果
任务二
源代码
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 template<typename T>
11 void output(const T& c);
12
13 int rand_int_100();
14 void test1();
15 void test2();
16
17 int main() {
18 cout << "测试1: \n";
19 test1();
20
21 cout << "\n测试2: \n";
22 test2();
23 }
24
25 //输出容器对象c中的元素
26 template<typename T>
27 void output(const T& c) {
28 for (auto& i : c)
29 cout << i << " ";
30 cout << endl;
31 }
32
33
34 //返回[0,100]内一随机整数
35 int rand_int_100() {
36 return rand() % 101;
37 }
38
39 //赋值并排序
40 void test1() {
41 vector<int>v0(10);
42 generate(v0.begin(), v0.end(), rand_int_100);
43 cout << "v0:";
44 output(v0);
45
46 vector<int> v1{ v0 };
47 sort(v1.begin(), v1.end());//默认是升序排序
48 cout << "v1: ";
49 output(v1);
50
51 vector<int>v2{ v0 };
52 sort(v2.begin() + 1, v2.end() - 1);
53 cout << "v2:";
54 output(v2);
55 }
56
57 //赋值并求最值和均值
58 void test2() {
59 vector<int>v0(10);//不是{},()是指定vector的大小
60 generate(v0.begin(), v0.end(), rand_int_100);
61 cout << "v0:";
62 output(v0);
63
64 auto iter1 = min_element(v0.begin(), v0.end());
65 cout << "最小值: " << *iter1 << endl;
66
67 auto iter2 = max_element(v0.begin(), v0.end());
68 cout << "最大值: " << *iter2 << endl;
69
70 auto ans = minmax_element(v0.begin(), v0.end());
71 cout << "最小值：" << *(ans.first) << endl;
72 cout << "最大值：" << *(ans.second) << endl;
73
74 double avg1 = accumulate(v0.begin(), v0.end(), 0) / v0.size();
75 cout << "均值：" << fixed << setprecision(2) << avg1 << endl;
76
77 cout << endl;
78 vector<int>v1{ v0 };
79 cout << "v0:";
80 output(v0);
81 sort(v1.begin(), v1.end());
82 double avg2 = accumulate(v1.begin() + 1, v1.end() - 1, 0) / (v1.size() - 2);
83 cout << "去掉最大值、最小值之后，均值: " << avg2 << endl;
84 }
View Code
运行结果
任务三
源代码
1 #include<iostream>
2 #include<string>
3 #include<algorithm>
4 bool is_palindrome(std::string s);
5
6 int main()
7 {
8 using namespace std;
9 string s;
10 while (cin >> s)
11 cout << boolalpha << is_palindrome(s) << endl;
12 }
13 bool is_palindrome(std::string s)
14 {
15 std::string s0{ s };
16 reverse(s0.begin(), s0.end());
17 if (s0 == s)
18 return true;
19 else
20 return false;
21 }
View Code
运行结果
任务四
源代码
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4
5 //用字符串流实现
6 #include<sstream>
7 #include<bitset>
8
9
10 std::string dec2n(int x, int n = 2);
11
12 int main() {
13 using namespace std;
14 int x;
15 while (cin >> x) {
16 cout << "十进制: " << x << endl;
17 cout << "二进制: " << dec2n(x) << endl;
18 cout << "八进制: " << dec2n(x, 8) << endl;
19 cout << "十六进制: " << dec2n(x, 16) << endl << endl;
20 }
21 }
22
23 std::string dec2n(int x, int n) {
24 using namespace std;
25
26 stringstream num;
27
28 //二进制
29 if (n == 2)
30 {
31 num.str("");//清空stringstream
32 num << bitset<8>(x).to_string();
33 //bitset<int>限制位数，to_string将int类型转化为string
34 //但是多余的0要怎么去掉？
35 return num.str();
36 }
37
38 if (n == 8)
39 {
40 num.str("");
41 num << oct << x;//oct转化为八进制
42 return num.str();
43 }
44
45 if (n == 16)
46 {
47 num.str("");
48 num << hex << uppercase << x;//hex十六进制，uppercase大写
49 return num.str();
50 }
51 }
View Code
//可以尝试用栈实现
运行结果
任务五
源代码
1 #include<iostream>
2 #include<vector>
3 #include<string>
4 #include<algorithm>
5 #include<iomanip>
6
7 using namespace std;
8
9 template<typename T>
10 void output(const T& c) {
11 for (auto& i : c)
12 cout << i << " ";
13 cout << endl;
14 }
15
16 void test1();
17
18 int main()
19 {
20 test1();
21 return 0;
22 }
23
24 void test1()
25 {
26 //用字符串初始化vector
27 string str1 = "abcdefghijklmnopqrstuvwxyz";
28 //string str2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
29 vector<char> vec1(str1.begin(), str1.end());
30 //vector<char> vec2(str2.begin(), str2.end());
31
32 //输出第一列
33 cout << setw(3)<<" ";
34 output(str1);
35
36 //转换为大写字母
37 for (auto& c : vec1) {
38 if (std::islower(c)) {
39 c = toupper(static_cast<unsigned char>(c));
40 }
41 }
42 int i = 1;
43 for (i = 1; i < 27; i++)
44 {
45 cout <<setw(2)<< i;
46 cout << " ";
47 rotate(vec1.begin(), vec1.begin() + 1, vec1.end());
48 output(vec1);
49 }
50 }
View Code
运行截图
任务六
源代码
1 #include<iostream>
2 #include<random>
3 #include<string>
4 #include<iomanip>
5
6 using namespace std;
7
8 void test();
9
10 int main() {
11 test();
12 return 0;
13 }
14
15 void test() {
16 //参考了ai
17 random_device rd;//获取随机数种子
18 mt19937 gen(rd());//随机数生成器
19
20 uniform_int_distribution<>dis(1, 10);//限定范围在1到10
21
22 int correct = 0;
23
24 for (int i = 0; i < 10; i++) {
25 int n1 = dis(gen);
26 int n2 = dis(gen);
27
28 char op=0;//加减乘除
29 int ans=0;//答案
30
31
32 ////如果不能整除
33 //if ((op == '/') && (n1 % n2) != 0) {
34 // do {
35 // n2 = dis(gen);
36 // } while (n1 % n2 != 0);
37 //}
38
39 do {
40 int rad = gen()%4;
41 switch (rad) {
42 case 0:op = '/'; break;
43 case 1:op = '+'; break;
44 case 2:op = '*'; break;
45 case 3:op = '-'; break;
46 }
47
48 //要让n1比n2大
49 if (op == '-')
50 {
51 if (n1 <= n2) {
52 swap(n1, n2);
53 }
54 }
55 } while ((op == '/') && (n1 % n2 != 0));
56
57
58
59 //计算答案
60 switch (op){
61 case '+':ans = n1 + n2; break;
62 case'-':ans = n1 - n2; break;
63 case'*':ans = n1 * n2; break;
64 case'/':ans = n1 / n2; break;
65 }
66
67
68 //显示题目，获取答案
69 cout << n1 << " " << op << " " << n2 << " = ";
70 int ans_user;
71 cin >> ans_user;
72
73
74 //判断，统计正确个数
75 if (ans_user == ans)correct++;
76 }
77
78 //输出正确率
79 double crt = static_cast<double>(correct) / 10 * 100;
80 cout << fixed << setprecision(2) << "正确率：" << crt << "%" << endl;
81 }
View Code
运行截图(出现➗的概率好小啊）
实验总结
标签：begin,初体验,end,cout,int,编程,C++,v0,include From： https://www.cnblogs.com/yrx0415/p/18453546