实验任务一
task1.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 #include <iostream>
7 #include <string>
8 #include <vector>
9 #include <algorithm>
10 using namespace std;
11 // 声明
12 // 模板函数声明
13 template<typename T>
14 void output(const T &c);
15 // 普通函数声明
16 void test1();
17 void test2();
18 void test3();
19 int main() {
20 cout << "测试1: \n";
21 test1();
22 cout << "\n测试2: \n";
23 test2();
24 cout << "\n测试3: \n";
25 test3();
26 }
27 // 函数实现
28 // 输出容器对象c中的元素
29 template <typename T>
30 void output(const T &c) {
31 for(auto &i: c)
32 cout << i << " ";
33 cout << endl;
34 }
35 // 测试1
36 // 组合使用算法库、迭代器、string反转字符串
37 void test1() {
38 string s0{"0123456789"};
39 cout << "s0 = " << s0 << endl;
40 string s1{s0};
41 reverse(s1.begin(), s1.end()); // 反转指定迭代器区间的元素
42 cout << "s1 = " << s1 << endl;
43
44 string s2{s0};
45 reverse_copy(s0.begin(), s0.end(), s2.begin()); // 将指定迭代区间的元素拷贝
46
47 cout << "s2 = " << s2 << endl;
48 }
49 // 测试2
50 // 组合使用算法库、迭代器、vector反转动态数组对象vector内数据
51 void test2() {
52 vector<int> v0{2, 0, 4, 9};
53 cout << "v0: ";
54 output(v0);
55 vector<int> v1{v0};
56 reverse(v1.begin(), v1.end());
57 cout << "v1: ";
58 output(v1);
59 vector<int> v2{v0};
60 reverse_copy(v0.begin(), v0.end(), v2.begin());
61 cout << "v2: ";
62 output(v2);
63 }
64 // 测试3
65 // 组合使用算法库、迭代器、vector实现元素旋转移位
66 void test3() {
67 vector<int> v0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
68 cout << "v0: ";
69 output(v0);
70
71 vector<int> v1{v0};
72 rotate(v1.begin(), v1.begin()+1, v1.end()); // 旋转指定迭代器区间
73 cout << "v1: ";
74 output(v1);
75 vector<int> v2{v0};
76 rotate(v2.begin(), v2.begin()+2, v2.end());
77 cout << "v2: ";
78 output(v2);
79 vector<int> v3{v0};
80 rotate(v3.begin(), v3.end()-1, v3.end());
81 cout << "v3: ";
82 output(v3);
83 vector<int> v4{v0};
84 rotate(v4.begin(), v4.end()-2, v4.end());
85 cout << "v4: ";
86 output(v4);
87 }
运行测试
实验任务二
task2.cpp
1 #include <iostream>
2 #include <vector>
3 #include <string>
4 #include <algorithm>
5 #include <numeric>
6 #include <iomanip>
7 using namespace std;
8 // 函数声明
9 // 模板函数声明
10 template<typename T>
11 void output(const T &c);
12 // 普通函数声明
13 int rand_int_100();
14 void test1();
15 void test2();
16 int main() {
17 cout << "测试1: \n";
18 test1();
19 cout << "\n测试2: \n";
20 test2();
21 }
22 // 函数实现
23 // 输出容器对象c中的元素
24 template <typename T>
25 void output(const T &c) {
26 for(auto &i: c)
27 cout << i << " ";
28 cout << endl;
29 }
30 // 返回[0, 100]区间内的一个随机整数
31 int rand_int_100() {
32 return rand() % 101;
33 }
34 // 测试1
35 // 对容器类对象指定迭代器区间进行赋值、排序
36 void test1() {
37 vector<int> v0(10); // 创建一个动态数组对象v0, 对象大小为10
38 generate(v0.begin(), v0.end(), rand_int_100); // 产生[0, 100]之间的随机整数
39
40 cout << "v0: ";
41 output(v0);
42 vector<int> v1{v0};
43 sort(v1.begin(), v1.end()); // 对指定迭代器区间[v1.begin(), v1.end())内数据
44 cout << "v1: ";
45 output(v1);
46 vector<int> v2{v0};
47 sort(v2.begin()+1, v2.end()-1);
48
49 cout << "v2: ";
50 output(v2);
51 }
52 // 测试2
53 // 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
54 void test2() {
55 vector<int> v0(10);
56 generate(v0.begin(), v0.end(), rand_int_100);
57 cout << "v0: ";
58 output(v0);
59 auto iter1 = min_element(v0.begin(), v0.end());
60 cout << "最小值: " << *iter1 << endl;
61 auto iter2 = max_element(v0.begin(), v0.end());
62 cout << "最大值: " << *iter2 << endl;
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 cout << endl;
69 vector<int> v1{v0};
70 cout << "v0: ";
71 output(v0);
72 sort(v1.begin(), v1.end());
73 double avg2 = accumulate(v1.begin()+1, v1.end()-1, 0)/(v1.size()-2);
74 cout << "去掉最大值、最小值之后，均值: " << avg2 << endl;
75 }
运行测试
实验任务三
task3.cpp
1 #include <iostream>
2 #include <string>
3 #include <algorithm>
4 bool is_palindrome(std::string s);
5 int main() {
6 using namespace std;
7 string s;
8 while(cin >> s) // 多组输入，直到按下Ctrl+Z后结束测试
9 cout << boolalpha << is_palindrome(s) << endl;
10 }
11 bool is_palindrome(std::string s){
12 int len=s.size();
13 int i;
14 for (i=0;i<len/2;i++)
15 if(s[i] == s[len-1-i]){
16 return true;
17 }
18 else{
19 return false;
20 }
21 }
实验任务4
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 std::string dec2n(int x,int n){
20 std::string s="0123456789ABCDEF";
21 std::string result;
22 int num;
23 if (x==0) return "0";
24
25 while (x>0){
26 num=x%n;
27 result=s[num]+result;
28 x=x/n;
29 }
30 return result;
31 }
实验任务5
task5.cpp
1 #include<iostream>
2 #include<string>
3 #include<algorithm>
4 #include<iomanip>
5 #include<vector>
6
7 int main(){
8 using namespace std;
9 cout<<" ";
10 vector<char> arr;
11 for (int i=0;i<26;i++){
12 cout<<" ";
13 cout<<char('a'+i);
14 arr.push_back(char('A'+i));
15 }
16 cout<<endl;
17 for(int i=1;i<=26;i++){
18 cout<<setw(2)<<setfill(' ')<<i;
19 rotate(arr.begin(),arr.begin()+1,arr.end());
20 for (char x:arr){
21 cout<<' ';
22 cout<<x;
23 }
24 cout<<endl;
25 }
26 return 0;
27 }
实验任务6
task6.cpp
1 #include<iostream>
2 #include<stdlib.h>
3 #include<ctime>
4 #include<string>
5 #include<algorithm>
6 #include<iomanip>
7 using namespace std;
8
9 int result(int n);
10
11 int main(){
12 srand(time(NULL));
13 double ans=0;
14 for (int i=0;i<10;i++){
15 int sym=rand()%4;
16 ans += result(sym);
17 }
18 cout<<"正确率: "<<fixed<<setprecision(2)<<ans/0.1<<"%"<<endl;
19 return 0;
20 }
21
22 int result(int n){
23 int get;
24 if (n==0){
25 int a=rand()%10+1;
26 int b=rand()%10+1;
27 int res=a+b;
28 cout<<a<<" + "<<b<<" = ";
29 cin>>get;
30 if (get==res){
31 return 1;
32 }
33 else{
34 return 0;
35 }
36 }
37 else if (n==1){
38 int a=rand()%10+1;
39 int b=rand()%10+1;
40 int res=a*b;
41 cout<<a<<" * "<<b<<" = ";
42 cin>>get;
43 if (get==res){
44 return 1;
45 }
46 else{
47 return 0;
48 }
49 }
50 else if (n==2){
51 int a=rand()%10+1;
52 int b,res;
53 do{
54 b=rand()%10+1;
55 }while(a%b);
56 res=a/b;
57 cout<<a<<" / "<<b<<" = ";
58 cin>>get;
59 if (get==res){
60 return 1;
61 }
62 else{
63 return 0;
64 }
65 }
66 else if (n==3){
67 int a=rand()%10+1;
68 int b,res;
69 do{
70 b=rand()%10+1;
71 }while(a<b);
72 res=a-b;
73 cout<<a<<" - "<<b<<" = ";
74 cin>>get;
75 if (get==res){
76 return 1;
77 }
78 else{
79 return 0;
80 }
81 }
82 }
标签：begin,初体验,cout,int,编程,c++,v0,v1,include From： https://www.cnblogs.com/wyhzmd/p/18453476