实验1

#include <algorithm>
//#include <typeinfo>
//#include <iomanip>
//#include <map>
#include <vector>
#include <string>
#include <iostream>

using namespace std;
using std::string;

// 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;

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

// 普通函数声明
int rand_int_100();
void test1();
void test2();

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

    cout << "\n测试2: \n";
    test2();
}

// 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;
}

// 返回[0, 100]区间内的一个随机整数
int rand_int_100() {
    return rand() % 101;
}

// 测试1
// 对容器类对象指定迭代器区间进行赋值、排序
void test1() {
    vector<int> v0(10);  // 创建一个动态数组对象v0, 对象大小为10
    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
    cout << "v0: ";
    output(v0);

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

    vector<int> v2{v0};
    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
    cout << "v2: ";
    output(v2);
}

// 测试2
// 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
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;
}

 

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

bool is_palindrome(std::string s);

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

    while(cin >> s)
        cout << boolalpha << is_palindrome(s) << endl;
}

bool is_palindrome(std::string s)
{
    int i, j;
    
    for(i=0,j = s.size()-1; i<s.size() && j>=0; i++,j--)
    {
        if(s.at(i) != s.at(j))
            return false;
    }
    
    return true;
}

 

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

using namespace std;
std::string dec2n(int x, int n = 2);

std::string OX{"0123456789ABCDEFG"};

int main() {
    using namespace std;

    int x;
    while(cin >> x) {
        cout << "十进制: " << x << endl;
        cout << "二进制: " << dec2n(x) << endl;
        cout << "八进制: " << dec2n(x, 8) << endl;
        cout << "十六进制: " << dec2n(x, 16) << endl << endl;
    }
}

std::string dec2n(int x, int n)
{
    std::string a;
    
    if(x==0)
        return "0"; 
    else
    {
        while(x!=0)
        {
            a += OX[x%n];
            x/=n;
        }
        reverse(a.begin(),a.end());
    }
    
    return a;
}

#include <typeinfo>
#include <iomanip>
#include <map>
#include <string>
#include <iostream>

using namespace std;
using std::string;

std::string arr{"abcdefghijklmnopqrstuvwxyz"};
std::string ARR{"ABCDEFGHIJKLMNOPQRSTUVWXYZ"};

int main()
{    
    for(int i=0; i<27; i++)
    {
        if(i==0)
        {
            cout << "  ";
            for(int j=0; j<27; j++)
                cout << setw(2) << arr[j];
            cout << endl;
        }
        else
        {
            cout << setw(2) << i;
            for(int j=0; j<27; j++)
            {
                int k = i+j;
                if(k>26)
                    k-=27;
                if(k==0)
                    cout << ARR[k];
                else
                    cout << setw(2) << ARR[k];
            }
            cout << endl;
        }
    }
    
    return 0;
}

 

#include <typeinfo>
#include <iomanip>
#include <map>
#include <string>
#include <iostream>
#include <time.h>

using namespace std;
using std::string;

std::string NUM{"0123456789"};
std::string F{"+-*/"};

Judg(char A, char F, char B, int ans)
{
    int a,b,Tans;
    switch(A)
    {
        case '0': a=0;
        case '1': a=1;
        case '2': a=2;
        case '3': a=3;
        case '4': a=4;
        case '5': a=5;
        case '6': a=6;
        case '7': a=7;
        case '8': a=8;
        case '9': a=9;
    }
    switch(B)
    {
        case '0': b=0;
        case '1': b=1;
        case '2': b=2;
        case '3': b=3;
        case '4': b=4;
        case '5': b=5;
        case '6': b=6;
        case '7': b=7;
        case '8': b=8;
        case '9': b=9;
    }
    switch(F)
    {
        case '+': Tans=a+b;
        case '-': Tans=a-b;
        case '*': Tans=a*b;
        case '/': Tans=a/b;
    }
    if(Tans==ans)
        return 1;
    else
        return 0;
}

int main()
{    
    srand((unsigned int)time(NULL));

    int ans,r;
    double yes=0;
    char f,a,b;
    for(int i0=0; i0<10; i0++)
    {
        r = rand()%3;
        f = F[r];
        r = rand()%9;
        a = NUM[r]+1;
        r = rand()%9;
        b = NUM[r]+1;
        
        while(f=='-' && a<b)
        {
            r = rand()%9;
            a = NUM[r]+1;
        }
        while(f=='/' && a%b!=0)
        {
            r = rand()%9;
            a = NUM[r]+1;
        }
        
           cout << a << " " << f << " " << b << " " << "=" << " ";
        cin >> ans;
        
        if(Judg(a,f,b,ans));
            yes++;
    }
    yes*=10;
    cout << "正确率：" << fixed << setprecision(2) << yes << "%" << endl;
    
    return 0;
}