实验一

//
// 现代C++标准库、算法库体验
// 本例用到以下内容:
// 1. 字符串string, 动态数组容器类vector、迭代器
// 2. 算法库：反转元素次序、旋转元素
// 3. 函数模板、const引用作为形参

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

// 声明
// 模板函数声明
template<typename T>
void output(const T &c);

// 普通函数声明
void test1();
void test2();
void test3();

int main() {
cout << "测试1: \n";
test1();

cout << "\n测试2: \n";
test2();

cout << "\n测试3: \n";
test3();
}

// 函数实现
// 输出容器对象c中的元素
template <typename T>
void output(const T &c) {
for(auto &i: c)
cout << i << " ";
cout << endl;
}

// 测试1
// 组合使用算法库、迭代器、string反转字符串
void test1() {
string s0{"0123456789"};
cout << "s0 = " << s0 << endl;

string s1{s0};
reverse(s1.begin(), s1.end()); // 反转指定迭代器区间的元素
cout << "s1 = " << s1 << endl;

string s2{s0};
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
cout << "s2 = " << s2 << endl;
}

// 测试2
// 组合使用算法库、迭代器、vector反转动态数组对象vector内数据
void test2() {
vector<int> v0{2, 0, 4, 9};
cout << "v0: ";
output(v0);

vector<int> v1{v0};
reverse(v1.begin(), v1.end());
cout << "v1: ";
output(v1);

vector<int> v2{v0};
reverse_copy(v0.begin(), v0.end(), v2.begin());
cout << "v2: ";
output(v2);
}

// 测试3
// 组合使用算法库、迭代器、vector实现元素旋转移位
void test3() {
vector<int> v0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
cout << "v0: ";
output(v0);

vector<int> v1{v0};
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
cout << "v1: ";
output(v1);

vector<int> v2{v0};
rotate(v2.begin(), v2.begin()+2, v2.end());
cout << "v2: ";
output(v2);

vector<int> v3{v0};
rotate(v3.begin(), v3.end()-1, v3.end());
cout << "v3: ";
output(v3);

vector<int> v4{v0};
rotate(v4.begin(), v4.end()-2, v4.end());
cout << "v4: ";
output(v4);
}

 

#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<numeric>
#include<iomanip>
using namespace std;
template<typename T>
void output(const T& c) {
    for (auto& i : c)
        cout << i << " ";
    cout << endl;
}
int rand_int_100() {
    return rand() % 101;
}
void test1() {
    vector<int> v0(10);
    generate(v0.begin(), v0.end(), rand_int_100);
    cout << "v0:";
    output(v0);
    vector<int> v1{ v0 };
    sort(v1.begin(), v1.end());
    cout << "v1:";
    output(v1);
    vector<int> v2{ v0 };
    sort(v2.begin() + 1, v2.end() - 1);
    cout << "v2:";
    output(v2);
}
void test2() {
    vector<int> v0(10);
    generate(v0.begin(), v0.end(), rand_int_100);
    cout << "v0:";
    output(v0);
    auto iter1 = min_element(v0.begin(), v0.end());
    cout << "最小值:" << *iter1 << endl;
    auto iter2 = max_element(v0.begin(), v0.end());
    cout << "最大值:" << *iter2 << endl;
    auto ans = minmax_element(v0.begin(), v0.end());
    cout << "最小值:" << *(ans.first) << endl;
    cout << "最大值:" << *(ans.second) << endl;
    double avg1 = accumulate(v0.begin(), v0.end(), 0) / v0.size();
    cout << "均值:" << fixed << setprecision(2) << avg1 << endl;
    cout << endl;
    vector<int> v1{ v0 };
    cout << "v0:";
    output(v0);
    sort(v1.begin(), v1.end());
    double avg2 = accumulate(v1.begin() + 1, v1.end() - 1, 0) / (v1.size() - 2);
    cout << "去掉最大值、最小值之后，均值:" << avg2 << endl;

}
int main() {
    cout << "测试1:\n";
    test1();
    cout << "测试2:\n";
    test2();
}

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
bool is_palindrome(string s) {
    string s1{ s };
    reverse(s1.begin(), s1.end());
    if (s1 == s)
        return true;
    return false;
}
int main() {
    string s;
    while (cin >> s)
        cout << boolalpha << is_palindrome(s) << endl;

}

#include <iostream>
#include <string>
#include <algorithm>

bool is_palindrome(std::string s);

int main() {
    using namespace std;
    string s;

    while(cin >> s)  // 多组输入，直到按下Ctrl+Z后结束测试
        cout << boolalpha << is_palindrome(s) << endl;

}

// 函数is_palindrom定义
// 待补足
// ×××
bool is_palindrome(std::string s){
    std::string b{s};
    reverse(s.begin(),s.end());
    if(s == b){
        return true;
    }else{
        return false;
    }
}

#include<bits/stdc++.h>
using namespace std;

int main() {
    cout << "  ";
    vector<char> arr;
    for(int i = 0;i < 26;i++){
        cout << " ";
        cout << char('a' + i);
        arr.push_back(char('A' + i));
    }
    cout << endl;
    for(int i = 1;i <= 26;i++){
        cout << setw(2) << setfill(' ') << i;
        rotate(arr.begin(),arr.begin() + 1,arr.end());
        for(auto ele:arr){
            cout << " ";
            cout << ele;
        }
        cout << endl;
    }


    return 0;
}

#include <iostream>
#include <vector>
#include <iomanip>
#include <numeric>
#include <time.h>

using namespace std;

int calculation();
int rand_int(int range) 
{
    srand((unsigned)time(NULL));
    return rand() % (range + 1);
}
char rand_flag() {
    vector<char> v = { '+', '-', '*',  '/' };
    return v[rand_int(3)];
}
void output(int a, int b, char flag) {
    cout << a << " " << flag << " " << b << " = ";
}

int main() 
{
    int num = 0;
    double ave = 0;
    while (++num <= 10) 
     {
        int ans, given_ans;
        ans = calculation();
        cin >> given_ans;
        if (ans == given_ans)
            ave++;
    }
    cout << "正确率：" << fixed << setprecision(2) << ave * 10 << "%" << endl;
}

int calculation() 
{
    char flag = rand_flag();
    if (flag == '+') 
    {
        int a = rand_int(10), b = rand_int(10);
        output(a, b, flag);
        return a + b;
    }
    else if (flag == '*') 
    {
        int a = rand_int(10), b = rand_int(10);
        output(a, b, flag);
        return a * b;
    }
    else if (flag == '-')
    {
        int a = rand_int(10), b = rand_int(10);
        while (a < b) 
       {
            int t = a;
            a = b;
            b = t;
        }
        output(a, b, flag);
        return a - b;
    }
    else
    {
        int a = rand_int(10);
        vector<int> v;
        int t = 0;
        while (1) 
       {
            for (int i = 1; i <= a; i++) 
           {
                if (a % i == 0)
                   {
                    v.push_back(i);
                    t++;
                }
            }
            if (t == 0)
                a = rand_int(10);
            else
                break;
        }
        int b = v[rand_int(t - 1)];
        output(a, b, flag);
        return a / b;
    }
}

 总结：比起巩固课上知识，我可能通过别人的代码学到的函数更多……可能我确实太菜了……多敲代码多学点吧……