实验1

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
template<typename T>
void output(const T& c);
void test1();
void test2();
void test3();
int main() {
    std::cout << "ceshi1\n";
    test1();
    std::cout << "\nceshi2\n";
    test2();
    std::cout << "\nceshi3\n";
    test3();
}
template<typename T>
void output(const T& c) {
    for (auto& i : c)
        std::cout << i << ' ';
    std::cout << '\n';
}
void test1() {
    using namespace std;
    string s0{ "0123456789" };
    cout << "s0=" << s0 << endl;
    string s1(s0);
    reverse(s1.begin(), s1.end());
    cout << "s1=" << s1 << endl;
    string s2(s0.size(), ' ');
    reverse_copy(s0.begin(), s0.end(), s2.begin());
    cout << "s2=" << s2 << endl;
}
void test2() {
    using namespace std;
    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() {
    using namespace std;
    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);
}

问题1：reverse 是直接反转，reverse_copy是复制并反转

问题2：通过指定一个“新首元素”来循环移动序列。它的参数是 (起始，新首元素，末尾)。

#include<vector>
#include<algorithm>
#include<numeric>
#include<iomanip>
#include<cstdlib>
#include<ctime>
#include <iostream>
template<typename T>
void output(const T& c);
int generate_random_number();
void test1();
void test2();
int main() {
    std::srand(std::time(0));
    std::cout << "ceshi1\n";
    test1();
    std::cout << "\nceshi2\n";
    test2();
}
template<typename T>
void output(const T& c) {
    for (auto& i : c)
        std::cout << i << ' ';
    std::cout << '\n';
}
int generate_random_number() {
    return std::rand() % 101;
}
void test1() {
    using namespace std;
    vector<int>v0(10);
    generate(v0.begin(), v0.end(), generate_random_number);
    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() {
    using namespace std;
    vector<int>v0(10);
    generate(v0.begin(), v0.end(), generate_random_number);
    cout << "v0:"; output(v0);
    auto min_iter = min_element(v0.begin(), v0.end());
    auto max_iter = max_element(v0.begin(), v0.end());
    cout << "zuixioazhi:" << *min_iter << endl;
    cout << "zuidazhi:" << *max_iter << endl;
    auto ans = minmax_element(v0.begin(), v0.end());
    cout << "zuixiaozhi:" << *(ans.first) << endl;
    cout << "zuidazhi:" << *(ans.second) << endl;
    double avg1 = accumulate(v0.begin(), v0.end(), 0.0) / v0.size();
    cout << "junzhi:" << fixed << setprecision(2) << avg1 << endl;
    sort(v0.begin(), v0.end());
    double avg2 = accumulate(v0.begin() + 1, v0.end() - 1, 0.0) / (v0.size() - 2);
    cout << "qudiaozuidazhihezuixiaozhihoujunzhi:" << avg2 << endl;
}

问题1：生成函数填充一个数组；

问题2：更简洁

问题3：等同

 1 #include<iostream>
 2 #include<string>
 3 #include<algorithm>
 4 #include<cctype>
 5 unsigned char func(unsigned char c);
 6 void test1();
 7 void test2();
 8 int main() {
 9     std::cout << "ceshi1\n";
10     test1();
11     std::cout << "\nceshi2\n";
12     test2();
13 }
14 unsigned char func(unsigned char c) {
15     if (c == 'z')
16         return 'a';
17     if (c == 'Z')
18         return 'A';
19     if (std::isalpha(c))
20         return static_cast<unsigned char>(c + 1);
21     return c;
22 }
23 void test1() {
24     std::string s1{ "Hello world 2049" };
25     std::cout << "s1=" << s1 << '\n';
26     std::string s2;
27     for (auto c : s1)
28         s2 += std::tolower(c);
29     std::cout << "s2=" << s2 << '\n';
30     std::string s3;
31     for (auto c : s1)
32         s3 += std::toupper(c);
33     std::cout << "s3=" << s3 << "\n";
34 }
35 void test2() {
36     std::string s1{ "I LOVE COSMOS!" };
37     std::cout << "s1=" << s1 << '\n';
38     std::string s2(s1.size(), ' ');
39     std::transform(s1.begin(), s1.end(), s2.begin(), func);
40     std::cout << "s2=" << s2 << '\n';
41 
42 }

问题1：将字母后移一位

问题2：tolower将字母全变成小写，toupper将字母全变成大写

问题3：输入起始，输入结束，输出起始，转换函数；s1自身被修改；

 1 #include<iostream>
 2 #include<string>
 3 #include<algorithm>
 4 bool is_palindrome(const std::string& s);
 5 bool is_palindrome_ignore_case(const std::string& s);
 6 int main() {
 7     using namespace std;
 8     string s;
 9     while (cin >> s) {
10         cout << boolalpha
11             << "区分大小写:" << is_palindrome(s) << "\n"
12             << "不区分大小写:" << is_palindrome_ignore_case(s) << "\n\n";
13     }
14 }
15 bool is_palindrome(const std::string& s) {
16     std::string s1{ s };
17     reverse(s1.begin(), s1.end());
18     if (s1 == s) {
19         return true;
20     }
21     else
22         return false;
23 
24 }
25 bool is_palindrome_ignore_case(const std::string& s) {
26     std::string s1;
27     for (auto c : s) {
28         s1 += std::tolower(c);
29         std::string s2{ s1 };
30         reverse(s2.begin(), s2.end());
31         if (s1 == s2) {
32             return true;
33         }
34         else
35             return false;
36     }
37 }

问题1：使用 std::getline() 来替代 cin >> s

 1 #include <iostream>
 2 #include<string>
 3 #include<algorithm>
 4 std::string dec2n(int x, int n = 2);
 5 int main() {
 6     int x;
 7     while (std::cin >> x) {
 8         std::cout << "十进制: " << x << '\n'
 9             << "二进制: " << dec2n(x) << '\n'
10             << "八进制: " << dec2n(x, 8) << '\n'
11             << "十二进制: " << dec2n(x, 12) << '\n'
12             << "十六进制: " << dec2n(x, 16) << '\n'
13             << "三十二进制: " << dec2n(x, 32) << "\n\n";
14     }
15 }
16 std::string dec2n(int x, int n) {
17     if (x == 0) {
18         return "0";
19     }
20 
21     std::string s;
22     const std::string a = { "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" };
23     while (x > 0) {
24         int b;
25         b = x % n;
26         s += a[b];
27         x = x / n;
28     }
29     std::reverse(s.begin(), s.end());
30     return s;
31 }

 1 #include<iostream>
 2 #include<string>
 3 #include<iomanip>
 4 using namespace std;
 5 int main() {
 6     string a{ " A B C D E F G H I J K L M N O P Q R S T U V W X Y Z" };
 7     cout << "   a b c d e f g h i j k l m n o p q r s t u v w x y z" << endl;
 8     for (int i = 1; i <= 26; i++) {
 9         rotate(a.begin(), a.begin() + 2, a.end());
10         if (i < 10) {
11             cout << " " << i << a << endl;
12         }
13         else cout << i << a << endl;
14     }
15     return 0;
16 }

 1 #include<iostream>
 2 #include<cstdlib>
 3 #include<ctime>
 4 #include<iomanip>
 5 #include<string>
 6 using namespace std;
 7 int main() {
 8     srand(time(0));
 9     int a = 0;
10     for (int i = 0; i < 10; i++) {
11         int x = rand() % 10 + 1;
12         int y = rand() % 10 + 1;
13         int o = rand() % 4;
14         char f;
15         int b;
16         switch (o) {
17         case 0:
18             f = '+';
19             b = x + y;
20             break;
21         case 1:
22             f = '-';
23             if (x < y) { swap(x, y); }
24             b = x - y;
25             break;
26         case 2:
27             f = '*';
28             b = x * y;
29             break;
30         case 3:
31             if (x < y) {
32                 swap(x, y);
33             }
34             if (x % y != 0) {
35                 do {
36                     x = rand() % 10 + 1;
37                     y = rand() % 10 + 1;
38                 } while (x % y != 0 || y == 0);
39             }
40             f = '/';
41             b = x / y;
42             break;
43         }
44         cout << x << " " << f << " " << y << "=";
45         int c;
46         cin >> c;
47         if (c == b) {
48             a++;
49         }
50     }
51     double s =(double)(a) / 10 * 100;
52     cout << "\n正确率：" << fixed << setprecision(2) << s << "%" << endl;
53     return 0;
54 }

posted @ 2025-10-13 21:52 zhj910 阅读(8) 评论(0) 收藏举报

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实验1

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