任务1：
源代码task1.cpp
1 #include<bits/stdc++.h>
2 using namespace std;
3
4 //模板函数声明
5 template<typename T>
6 void output(const T &c);
7
8 //普通函数声明
9 void test1();
10 void test2();
11 void test3();
12
13 int main(){
14 cout<<"测试1：\n";
15 test1();
16
17 cout<<"测试2：\n";
18 test2();
19
20 cout<<"测试3：\n";
21 test3();
22
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 {
29 for(auto &i: c)
30 cout<<i<<" ";
31 cout<<endl;
32 }
33
34 void test1(){
35 string s0{"0123456789"};
36 cout<<"s0 = "<<s0<<endl;
37
38 string s1={s0};
39 reverse(s1.begin(),s1.end()); //从头至尾反转元素
40 cout<<"s1 = "<<s1<<endl;
41
42 string s2={s0};
43 reverse_copy(s0.begin(),s0.end(),s2.begin()); //从头至尾复制，从第0位开始反转
44 cout<<"s2 = "<<s2<<endl;
45 }
46
47 void test2(){
48 vector<int> v0{2,0,4,9};
49 cout<<"v0: ";
50 output(v0);
51
52 vector<int> v1{v0};
53 reverse(v1.begin(),v1.end());
54 cout<<"v1: ";
55 output(v1);
56
57 vector<int> v2{v0};
58 reverse_copy(v0.begin(),v0.end(),v2.begin());
59 cout<<"v2: ";
60 output(v2);
61 }
62
63 void test3(){
64 vector <int> v0{0,1,2,3,4,5,6,7,8,9};
65 cout<<"v0: ";
66 output(v0);
67
68 vector<int> v1{v0};
69 rotate(v1.begin(),v1.begin()+1,v1.end());
70 //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
71 cout<<"v1: ";
72 output(v1);
73
74 vector<int> v2{v0};
75 rotate(v2.begin(),v2.begin()+2,v2.end());
76 cout<<"v2: ";
77 output(v2);
78
79 vector<int> v3{v0};
80 rotate(v3.begin(),v3.end()-1,v3.end());
81 cout<<"v3: ";
82 output(v3);
83
84 vector<int> v4{v0};
85 rotate(v4.begin(),v4.end()-2,v4.end());
86 cout<<"v4: ";
87 output(v4);
88
89 }
运行结果截图：
任务2：
源代码task2.cpp
1 #include<bits/stdc++.h>
2 using namespace std;
3
4 template <typename T>
5 void output(const T &c);
6
7 int rand_int_100();
8 void test1();
9 void test2();
10
11 int main()
12 {
13 cout<<"测试1：\n";
14 test1();
15
16 cout<<"测试2：\n";
17 test2();
18
19 }
20
21 template <typename T>
22 void output (const T &c){
23 for(auto &i: c)
24 cout<<i<<" ";
25 cout<<endl;
26
27 }
28
29 int rand_int_100(){
30 return rand()%101;
31
32 }
33
34 void test1(){
35 vector<int> v0(10);
36 generate(v0.begin(),v0.end(),rand_int_100);
37 cout<<"v0: ";
38 output(v0);
39
40 vector<int> v1{v0};
41 sort(v1.begin(),v1.end());
42 cout<<"v1: ";
43 output(v1);
44
45 vector <int> v2{v0};
46 sort(v2.begin()+1,v2.end()-1);
47 cout<<"v2: ";
48 output(v2);
49 }
50
51 void test2(){
52 vector<int> v0(10);
53 generate(v0.begin(),v0.end(),rand_int_100);
54 cout<<"v0: ";
55 output(v0);
56
57 auto iter1=min_element(v0.begin(),v0.end());
58 cout<<"最小值: "<<*iter1<<endl;
59
60 auto iter2=max_element(v0.begin(),v0.end());
61 cout<<"最大值："<<*iter2<<endl;
62
63 auto ans=minmax_element(v0.begin(),v0.end());
64 cout<<"最小值："<<*(ans.first)<<endl;
65 cout<<"最大值："<<*(ans.second)<<endl;
66 double avg1=accumulate(v0.begin(),v0.end(),0)/v0.size();
67 cout<<"均值："<<fixed<<setprecision(2)<<avg1<<endl;
68
69 cout<<endl;
70 vector<int> v1{v0};
71 cout<<"v0：";
72 output(v0);
73 sort(v1.begin(),v1.end());
74 double avg2=accumulate(v1.begin()+1,v1.end()-1,0)/(v1.size()-2);
75 cout<<"去掉最大值、最小值之后，均值："<<avg2<<endl;
76 }
运行结果截图：
任务3：
源代码task3.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
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 bool is_palindrome(std::string s){
17 int len=s.size();
18 int t=0;
19 for(int i=0;i<len;i++)
20 {
21 if(s[i]!=s[len-1-i])
22 t=1;
23 }
24 if(t==0)
25 return true;
26 else
27 return false;
28 }
运行结果截图：
任务4：
源代码task4.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
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 int t=0;
22 std::string ans;
23 do
24 {
25 t=x%n;
26 if(t>=0&&t<=9)
27 ans+=(t+'0');
28 else
29 ans+=(t+'A'-10);
30 x/=n;
31 }while(x>0);
32 reverse(ans.begin(),ans.end());
33 return ans;
34 }
运行结果截图：
任务5：
源代码task5.cpp
1 #include<bits/stdc++.h>
2 using namespace std;
3 int main()
4 {
5 string s1="abcdefghijklmnopqrstuvwxyz";
6 string s2="ABCDEFGHIJKLNMOPQRSTUVWXYZ";
7 cout<<" ";
8 for(int i=0;i<=26;i++)
9 cout<<setw(2)<<s1[i];
10 cout<<endl;
11 for(int i=1;i<26;i++)
12 {
13 cout<<setw(2)<<i;
14 for(int j=0;j<26;j++)
15 {
16 cout<<setw(2)<<s2[(j+i)%26];
17 }
18 cout<<endl;
19 }
20 cout<<endl;
21 return 0;
22 }
运行结果截图：
任务6：
源代码tssk6.cpp
1 #include<bits/stdc++.h>
2 using namespace std;
3 int main(){
4 srand((unsigned)time(NULL));
5 int ans;
6 int a,b,c;
7 double sum=0;
8 char op;
9 for(int i=1;i<=10;i++){
10 ans=0;
11 op="-+*/"[rand()%4];
12 if(op=='*')
13 {
14 a=rand()%10+1;
15 b=rand()%10+1;
16 ans=a*b;
17 }
18 else if(op=='+')
19 {
20 a=rand()%10+1;
21 b=rand()%10+1;
22 ans=a+b;
23 }
24 else if(op=='-')
25 {
26 a=rand()%10+1;
27 b=rand()%10+1;
28 while(b>a)
29 b=rand()%10+1;
30 ans=a-b;
31 }
32 else
33 {
34 a=rand()%10+1;
35 b=rand()%10+1;
36 while(a%b!=0)
37 b=rand()%10+1;
38 ans=a/b;
39 }
40 cout<<a<<" "<<op<<" "<<b<<" = ";
41 cin>>c;
42 if(c==ans)
43 sum++;
44 }
45 printf("%.2lf%\n",sum*10);
46 return 0;
47 }
运行结果截图：
实验总结：
（1）reverse(s1.begin(),s1.end()); //从头至尾反转元素
reverse_copy(s0.begin(),s0.end(),s2.begin()); //从头至尾复制，从第0位开始反转
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
（2）srand((unsigned)time(NULL));
int x=rand()%10+1; //随机生成[1,10]的整数x
标签：begin,初体验,end,cout,int,编程,C++,v0,v1 From： https://www.cnblogs.com/yhjXW/p/18464888