实验结论
1.实验任务1
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 template <typename T>
27 void output(const T &c) {
28 for(auto &i: c)//&表示i是一个引用变量，可以改变数组的值，反之不加则不改变
29 cout << i << " ";
30 cout << endl;
31 }
32
33 void test1() {
34 string s0{"0123456789"};
35 cout << "s0 = " << s0 << endl;
36
37 string s1{s0};
38 reverse(s1.begin(), s1.end());
39 cout << "s1 = " << s1 << endl;
40
41 string s2{s0};
42 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
43 cout << "s2 = " << s2 << endl;
44 }
45
46 void test2() {
47 vector<int> v0{2, 0, 4, 9};
48 cout << "v0: ";
49 output(v0);//格式化输出
50
51 vector<int> v1{v0};
52 reverse(v1.begin(), v1.end());
53 cout << "v1: ";
54 output(v1);
55
56 vector<int> v2{v0};
57 reverse_copy(v0.begin(), v0.end(), v2.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
58 cout << "v2: ";
59 output(v2);
60 }
61
62 void test3() {
63 vector<int> v0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
64 cout << "v0: ";
65 output(v0);
66
67 vector<int> v1{v0};
68 rotate(v1.begin(), v1.begin()+1, v1.end()); //数组想象成一个圆盘 ，rotate(),begin end是范围，+1 -1是从哪开始
69 cout << "v1: ";
70 output(v1);
71
72 vector<int> v2{v0};
73 rotate(v2.begin(), v2.begin()+2, v2.end());
74 cout << "v2: ";
75 output(v2);
76
77 vector<int> v3{v0};
78 rotate(v3.begin(), v3.end()-1, v3.end());
79 cout << "v3: ";
80 output(v3);
81
82 vector<int> v4{v0};
83 rotate(v4.begin(), v4.end()-2, v4.end());
84 cout << "v4: ";
85 output(v4);
86 }
View Code
运行结果截图：
2.实验任务2
代码：
1 #include <iostream>
2 #include <vector>
3 #include <string>
4 #include <algorithm>
5 #include <numeric>//算法包括求最大值、最小值、均值
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 template <typename T>
26 void output(const T &c) {
27 for(auto &i: c)
28 cout << i << " ";
29 cout << endl;
30 }
31
32 // 返回[0, 100]区间内的一个随机整数
33 int rand_int_100() {
34 return rand() % 101;
35 }
36
37 //赋值、排序
38 void test1() {
39 vector<int> v0(10); // 创建一个动态数组对象v0, 对象大小为10
40 //generate标准库算法，定义在<numeric> ,作用：它用于生成一个值的序列,并将其赋值给一个迭代器范围内的元素。
41 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
42 cout << "v0: ";
43 output(v0);
44
45 vector<int> v1{v0};
46 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
47 cout << "v1: ";
48 output(v1);
49
50 vector<int> v2{v0};
51 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
52 cout << "v2: ";
53 output(v2);
54 }
55
56 // 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
57 void test2() {
58 vector<int> v0(10);
59 generate(v0.begin(), v0.end(), rand_int_100);
60 cout << "v0: ";
61 output(v0);
62
63 auto iter1 = min_element(v0.begin(), v0.end());
64 cout << "最小值: " << *iter1 << endl;
65
66 auto iter2 = max_element(v0.begin(), v0.end());
67 cout << "最大值: " << *iter2 << endl;
68
69 auto ans = minmax_element(v0.begin(), v0.end());//minmax_element，先是 min，再 max，所以，返回的类中的数据成员 first 对应着最小值，second 对应着最大值。
70 cout << "最小值: " << *(ans.first) << endl;
71 cout << "最大值: " << *(ans.second) << endl;
72 double avg1 = accumulate(v0.begin(), v0.end(), 0)/v0.size();//accumulate累加求和 ，第三个是初始值为0，v0.size求个数
73 cout << "均值: " << fixed << setprecision(2) << avg1 << endl;//精确两位
74 //fixed 是一个流操纵符，用于设置输出流的浮点数显示格式。
75 //当应用了 fixed 操纵符后，浮点数将始终以固定小数点格式输出，保留小数点后六位（不是六位有效位），而不是科学计数法
76 cout << endl;//空格
77 vector<int> v1{v0};
78 cout << "v0: ";
79 output(v0);
80 sort(v1.begin(), v1.end());
81 double avg2 = accumulate(v1.begin()+1, v1.end()-1, 0)/(v1.size()-2);
82 cout << "去掉最大值、最小值之后，均值: " << avg2 << endl;
83 }
View Code
运行结果截图：
3.实验任务3
代码：
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
11 while(cin >> s) // 多组输入，直到按下Ctrl+Z后结束测试
12 cout << boolalpha << is_palindrome(s) << endl;
13 }
14
15 // 函数is_palindrom定义
16 // 待补足
17 bool is_palindrome(std::string s) {
18 int left = 0;
19 int right = s.length() - 1;
20 while (left < right) {
21 if (s[left] != s[right]) {
22 return false;
23 }
24 left++;
25 right--;
26 }
27 return true;
28 }
View Code
运行结果截图：
4.实验任务4
代码：
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
10 int x;
11 while(cin >> x) {
12 cout << "十进制: " << x << endl;
13 cout << "二进制: " << dec2n(x) << endl;
14 cout << "八进制: " << dec2n(x, 8) << endl;
15 cout << "十六进制: " << dec2n(x, 16) << endl << endl;
16 }
17 }
18
19 // 函数dec2n定义
20 std::string dec2n(int x, int n){
21 using namespace std;
22 string result;
23 string shu="0123456789ABCDEF";
24 while(x>0)
25 {
26 int remember=x%n;
27 result=shu[remember]+result;
28 x/=n;
29 }
30 if(result.empty()){
31 return "0";
32 }
33 return result;
34 }
View Code
运行结果截图：
5.实验任务5
代码：
1 #include <bits/stdc++.h>
2 using namespace std;
3
4 template<typename T>
5 void print(const T &c);
6
7 int main ()
8 {
9 cout<<" ";
10 vector<char> l1{'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
11 print(l1);
12 vector<char> l2{'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
13 for (int i=1;i<=26;++i)
14 {
15 cout<<setw(2)<<i;
16 rotate(l2.begin(), l2.begin()+1, l2.end());
17 print(l2);
18 }
19 }
20
21 template<typename T>
22 void print(const T &c)
23 {
24 for (auto &i:c)
25 cout<<setw(2)<<i;
26 cout<<endl;
27 }
View Code
运行结果截图：
6.实验任务6
代码：
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4 #include <vector>
5 #include <iomanip>
6 #include <ctime>
7 using namespace std;
8
9 int generateRan(int n);
10
11 int main() {
12 srand(time(NULL));
13 int num = 0;
14 for(int i = 0;i < 10;i++){
15 int a = rand()%4;
16 num += generateRan(a);
17 }
18 double avg = 1.0*num/10*100;
19 cout << "正确率为：";
20 cout << fixed << setprecision(2) << avg;
21 cout << "%" << endl;
22
23
24 return 0;
25 }
26
27 int generateRan(int n) {
28 if(n == 0){
29 int a = rand()%10 + 1;
30 int b = rand()%10 + 1;
31 int res = a + b;
32 int get;
33 cout << a;
34 cout << " + ";
35 cout << b;
36 cout << " = ";
37 cin >> get;
38 if(get == res){
39 return 1;
40 }else{
41 return 0;
42 }
43 }else if(n == 1){
44 int a = rand()%10 + 1;
45 int b,get;
46 do{
47 b = rand()%10 + 1;
48 }while(b > a);
49 int res = a - b;
50 cout << a;
51 cout << " - ";
52 cout << b;
53 cout << " = ";
54 cin >> get;
55 if(get == res){
56 return 1;
57 }else{
58 return 0;
59 }
60 }else if(n == 2){
61 int a = rand()%10 + 1;
62 int b = rand()%10 + 1;
63 int res = a * b;
64 int get;
65 cout << a;
66 cout << " x ";
67 cout << b;
68 cout << " = ";
69 cin >> get;
70 if(get == res){
71 return 1;
72 }else{
73 return 0;
74 }
75 }else if(n == 3){
76 int a = rand()%10 + 1;
77 int b,get;
78 do{
79 b = rand()%10 + 1;
80 }while(a % b != 0);
81 int res = a / b;
82 cout << a;
83 cout << " / ";
84 cout << b;
85 cout << " = ";
86 cin >> get;
87 if(get == res){
88 return 1;
89 }else{
90 return 0;
91 }
92 }
93 }
View Code
运行结果截图：
标签：10,begin,cout,int,编程,C++,v0,实验,include From： https://www.cnblogs.com/yr123/p/18462235