实验1：
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)
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());
43 cout << "s2 = " << s2 << endl;
44 }
45
46 void test2() {
47 vector<int> v0{2, 0, 4, 9};
48 cout << "v0: ";
49 output(v0);
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());
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());
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
实验2：
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 template <typename T>
26 void output(const T &c) {
27 for(auto &i: c)
28 cout << i << " ";
29 cout << endl;
30 }
31
32 int rand_int_100() {
33 return rand() % 101;
34 }
35
36 void test1() {
37 vector<int> v0(10);
38 generate(v0.begin(), v0.end(), rand_int_100);
39 cout << "v0: ";
40 output(v0);
41
42 vector<int> v1{v0};
43 sort(v1.begin(), v1.end());
44 cout << "v1: ";
45 output(v1);
46
47 vector<int> v2{v0};
48 sort(v2.begin()+1, v2.end()-1);
49 cout << "v2: ";
50 output(v2);
51 }
52
53 void test2() {
54 vector<int> v0(10);
55 generate(v0.begin(), v0.end(), rand_int_100);
56 cout << "v0: ";
57 output(v0);
58
59 auto iter1 = min_element(v0.begin(), v0.end());
60 cout << "最小值: " << *iter1 << endl;
61
62 auto iter2 = max_element(v0.begin(), v0.end());
63 cout << "最大值: " << *iter2 << endl;
64
65 auto ans = minmax_element(v0.begin(), v0.end());
66 cout << "最小值: " << *(ans.first) << endl;
67 cout << "最大值: " << *(ans.second) << endl;
68 double avg1 = accumulate(v0.begin(), v0.end(), 0)/v0.size();
69 cout << "均值: " << fixed << setprecision(2) << avg1 << endl;
70
71 cout << endl;
72
73 vector<int> v1{v0};
74 cout << "v0: ";
75 output(v0);
76 sort(v1.begin(), v1.end());
77 double avg2 = accumulate(v1.begin()+1, v1.end()-1, 0)/(v1.size()-2);
78 cout << "去掉最大值、最小值之后，均值: " << avg2 << endl;
79 }
View Code
实验3：
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)
12 cout << boolalpha << is_palindrome(s) << endl;
13 }
14 bool is_palindrome(std::string s)
15 {
16 int l = s.size();
17 int t = 0;
18 for(int i = 0;i<l/2;i++)
19 {
20 if(s[i] != s[l-i-1])
21 {
22 t = 1;
23 break;
24 }
25 }
26 if(t == 0)
27 return true;
28 else
29 return false;
30 }
实验4：
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 std::string dec2n(int x,int n)
19 {
20 char a[100000];
21 switch(n)
22 {
23 case 2:itoa(x,a,2);break;
24 case 8:itoa(x,a,8);break;
25 case 16:itoa(x,a,16);break;
26 }
27 for(int i = 0;i<100000;i++)
28 {
29 if(a[i]=='a')
30 a[i] = 'A';
31 if(a[i]=='b')
32 a[i] = 'B';
33 if(a[i]=='c')
34 a[i] = 'C';
35 if(a[i]=='d')
36 a[i] = 'D';
37 if(a[i]=='e')
38 a[i] = 'E';
39 if(a[i]=='f')
40 a[i] = 'F';
41 }
42 return a;
43 }
实验5：
1 #include<iostream>
2 #include<string>
3 #include<vector>
4 #include<algorithm>
5 #include<iomanip>
6
7 using namespace std;
8
9 template<typename T>
10 void output(const T &c);
11
12 int main()
13 {
14 vector<char>v0{'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','o','v','w','x','y','z'};
15 vector<char>v1{'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','O','V','W','X','Y','Z'};
16 cout << " ";
17 output(v0);
18 for(int i = 1;i<=26;i++)
19 {
20 vector<char>v2{v1};
21 cout <<setw(2) << i << " ";
22 rotate(v2.begin(),v2.begin()+i,v2.end());
23 output(v2);
24 }
25 }
26 template <typename T>
27 void output(const T &c){
28 for(auto &i:c)
29 cout << i <<" ";
30 cout << endl;
31 }
实验6：
1 #include<iostream>
2 #include<numeric>
3
4 using namespace std;
5
6 int main()
7 {
8 int t = 0;
9 int a,b,c;
10 for(int i = 1;i<=10;i++)
11 {
12 char s = "+-*/"[rand()%4];
13 int w = 0;
14 switch(s)
15 {
16 case '+':a = rand()%10+1;b = rand()%10+1;w = a+b;break;
17 case '-':a = rand()%10+1;b = rand()%a+1;w = a-b;break;
18 case '*':a = rand()%10+1;b = rand()%10+1;w = a*b;break;
19 case '/':
20 a = rand()%10+1;
21 for(int i = 2;i<=a;i++)
22 {
23 b = i;
24 for(int j = 1;j<=10;j++)
25 {
26 c = j;
27 if(b*c == a)
28 {
29 w = a/b;
30 break;
31 }
32 }
33 }
34 }
35 cout << a <<" " << s <<" "<< b <<" "<< "=" << " ";
36 int answer;
37 cin >> answer;
38 if(w == answer)
39 {
40 t++;
41 }
42 }
43 cout << "正确率：" << t*10 << ".00%" << endl;
44 }
收获：在本次实验报告中，对于实验4进制转换中查资料得知的itoa函数有深刻印象，可以用一行代码就实现十进制向其他进制的转换，美中不足的是转换成16进制后会是小写而非大写，得再专门转换成大写。
问题：实验6用了rand()%10+1来随机生成1-10的数字，但感觉来来回回就几道题变来变去，感觉并不是真正的随机。
标签：begin,初体验,end,cout,int,c++,v0,实验,include From： https://www.cnblogs.com/guguabiu/p/18453566