实验1现代C++编程初体验

任务1

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
template<typename T>
void output(const T &c) {
    for (auto &i : c)
        cout << i << " ";
    cout << endl;
}
void test1() {
    string s0{ "0123456789" };
    cout << "s0=" << s0 << endl;
    string s1{ s0 };
    reverse(s1.begin(), s1.end());
    cout << "s1=" << s1 << endl;
    string s2{ s0 };
    reverse_copy(s0.begin(), s0.end(), s2.begin());
    cout << "s2=" << s2 << endl;
}
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);
}
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());
    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);
}
int main() {
    cout << "测试1:\n";
    test1();
    cout << "\n测试2:\n";
    test2();
    cout << "\n测试3:\n";
    test3();
}

 

}

任务2

#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();
}

 

 任务3

#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;

}

 

 任务4

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
string dec2n(int x, int n = 2) {
    string ans;
    while (x) {
        if (x % n >= 10) {
            ans += char(x % n - 10 + 'A');
            x /= n;
        }
        else
        {
            ans += char(x % n + '0');
            x /= n;
        }

    }
    reverse(ans.begin(), ans.end());
    return ans;
}
int main() {
    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;
    }
    return 0;
}

 

 任务5

#include<iostream>
#include<algorithm>
#include<iomanip>
using namespace std;
void output(string& s) {
    for (auto& i : s)
        cout << setw(2)<<char(i-32);
    cout << endl;
}
int main() {
    string s{ 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','s','y','z' };
    cout << setw(4);
    for (auto& i : s)
        cout <<i<<setw(2);
    cout << endl;
    for (int i = 1; i <= 26; i++) {
        string s1{ s };
        cout << setw(2) << i;
        rotate(s1.begin(), s1.begin() + i, s1.end());
        output(s1);
    }
    return 0;
}

 

 任务6

#include<iostream>
#include<algorithm>
#include<iomanip>
using namespace std;
int main() {
    int cnts = 10;
    int ans = 0;
    int answer = 0;
    int correct = 0;
    while (cnts--) {
        int k = rand() % 4;
        int num1 = rand() % 11;
        int num2 = rand() % 11;
        switch (k)
        {
        case 1:
            cout << num1 << "+" << num2 << "=";
            ans = num1 + num2;
            break;
        case 2:
            if (num1 <= num2)
                swap(num1, num2);
            cout << num1 << "-" << num2 << "=";
            ans = num1 - num2;
            break;
                
        case 3:
            cout << num1 << "*" << num2<<"=";
            ans = num1 * num2;
            break;
        case 0:
            num1 = num2 * (rand() % (10 / num2 + 1));
            cout << num1 << "/" << num2 << "=";
            ans = num1 / num2;
            break;
        }
        cin >> answer;
        if (ans == answer)
            correct++;
    }
    cout << fixed << setprecision(2);
    cout << correct * 100.0 / 10 << "%";
    return 0;
}