C语言程序设计之小系统

 #include <stdio.h>
#include <math.h>
#include <iostream>
#include <string>
#include <cstring>
#include <algorithm>
#include <iomanip>
#include <sstream> 
using namespace std;

// 学生信息结构体
struct student {
    char xh[13]; // 学号
    char name[21]; // 姓名
    int a, b, c; // 三门课程成绩
} stu[100];

// 函数声明
int isPrime(int n);
int reverseNum(int n);
void fun1();
string digitToWord(int digit);
void fun2();
long long stringToLongLong(const string& str);
void fun4();
void fun5();
void fun6();
void fun7();
void fun8();
void fun3();

// 判断是否为素数
int isPrime(int n) {
    if (n <= 1) return 0;
    for (int i = 2; i <= sqrt(n); i++) {
        if (n % i == 0) return 0;
    }
    return 1;
}

// 翻转数字
int reverseNum(int n) {
    int reversed = 0;
    while (n > 0) {
        reversed = reversed * 10 + n % 10;
        n /= 10;
    }
    return reversed;
}

// Fun1: 可逆素数
void fun1() {
    int start, end;
    printf("请输入范围的起始值和结束值（以空格分隔）: ");
    scanf("%d %d", &start, &end);

    int count = 0;
    for (int i = start; i <= end; i++) {
        if (isPrime(i) && isPrime(reverseNum(i))) {
            count++;
        }
    }
    printf("可逆素数的数量: %d\n", count);
}

// Fun2: 计算数字总和
string digitToWord(int digit) {
    switch (digit) {
        case 0: return "zero";
        case 1: return "one";
        case 2: return "two";
        case 3: return "three";
        case 4: return "four";
        case 5: return "five";
        case 6: return "six";
        case 7: return "seven";
        case 8: return "eight";
        case 9: return "nine";
        default: return "";
    }
}

void fun2() {
    string n;
    printf("请输入一个数字串: ");
    cin >> n;

    long long sum = 0;
    for (int i = 0; i < n.length(); i++) {
        char c = n[i];
        if (isdigit(c)) {
            sum += c - '0';
        }
    }
    stringstream ss;
    ss << sum;
    string sumStr = ss.str();

    printf("数字总和的英文表示: ");
    for (int i = 0; i < sumStr.length(); i++) {
        cout << digitToWord(sumStr[i] - '0') << (i == sumStr.length() - 1 ? "" : " ");
    }
    cout << endl;
}

// 字符串转长整型辅助函数
long long stringToLongLong(const string& str) {
    long long result = 0;
    stringstream ss(str);
    ss >> result;
    return result;
}

// Fun3: 各位数字之和排序
void fun3() {
    int sum[10], a[10];
    int n, i, j, temp;
    printf("请输入数字的个数（输入0结束）: ");
    while (~scanf("%d", &n) && n) {
        for (i = 0; i < n; i++) {
            sum[i] = 0;
        }
        printf("请输入数字: ");
        for (i = 0; i < n; i++) {
            scanf("%d", &a[i]);
            temp = a[i];
            for (j = 0;; j++) {
                sum[i] += temp % 10;
                temp = temp / 10;
                if (temp == 0) break;
            }
        }
        for (i = 0; i < n - 1; i++) {
            for (j = i + 1; j < n; j++) {
                if (sum[i] > sum[j]) {
                    temp = sum[i];
                    sum[i] = sum[j];
                    sum[j] = temp;
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        printf("排序后的数字: ");
        for (i = 0; i < n; i++) {
            if (i == 0)
                printf("%d", a[i]);
            else
                printf(" %d", a[i]);
        }
        printf("\n");
        printf("请输入数字的个数（输入0结束）: ");
    }
}

// Fun4: 字符串中的最大整数
void fun4() {
    string s;
    printf("请输入字符串（以#结束）: ");
    getline(cin, s, '#');

    long long max_num = -1;
    bool found = false;
    string num;

    for (int i = 0; i < s.length(); i++) {
        char c = s[i];
        if (isdigit(c)) {
            num += c;
            found = true;
        } else {
            if (!num.empty()) {
                max_num = max(max_num, stringToLongLong(num));
                num = "";
            }
        }
    }

    if (!num.empty()) {
        max_num = max(max_num, stringToLongLong(num));
    }

    if (found) {
        printf("字符串中的最大整数: %lld\n", max_num);
    } else {
        printf("none\n");
    }
}

// Fun5: 字符串解压
void fun5() {
    string compressed;
    printf("请输入压缩字符串: ");
    cin >> compressed;

    string decompressed = "";
    for (int i = 0; i < compressed.length(); i++) {
        if (isdigit(compressed[i])) {
            int count = 0;
            while (i < compressed.length() && isdigit(compressed[i])) {
                count = count * 10 + (compressed[i] - '0');
                i++;
            }
            i--;
            decompressed += string(count, compressed[++i]);
        } else {
            decompressed += compressed[i];
        }
    }
    printf("解压后的字符串: %s\n", decompressed.c_str());
}

// Fun6: 输出指定图形
void fun6() {
    int n;
    printf("请输入图形的行数: ");
    cin >> n;

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            cout << setw(6) << left << i * j;
        }
        cout << endl;
    }
}

// Fun7: 计算学生信息操作之最高分
void fun7() {
    int n;
    printf("请输入学生人数: ");
    scanf("%d", &n); // 输入学生人数
    int totalScores[100]; // 存储每个学生的总分

    // 输入学生信息
    printf("请输入每个学生的学号、姓名和三门课程成绩:\n");
    for (int i = 0; i < n; i++) {
        scanf("%s %s %d %d %d", stu[i].xh, stu[i].name, &stu[i].a, &stu[i].b, &stu[i].c);
    }

    // 计算每个学生的总分
    for (int i = 0; i < n; i++) {
        totalScores[i] = stu[i].a + stu[i].b + stu[i].c;
    }

    // 找到总分最高的学生
    int maxScore = totalScores[0];
    int topStudentIndex = 0;
    for (int i = 1; i < n; i++) {
        if (totalScores[i] > maxScore) {
            maxScore = totalScores[i];
            topStudentIndex = i;
        }
    }

    // 输出总分最高的学生的信息
    printf("总分最高的学生信息: %s %s %d %d %d\n", stu[topStudentIndex].xh, stu[topStudentIndex].name, stu[topStudentIndex].a, stu[topStudentIndex].b, stu[topStudentIndex].c);
}

// Fun8: 字符串反转
void fun8() {
    string s;
    printf("请输入要反转的字符串: ");
    cin >> s; // 使用 cin 读取字符串

    printf("原字符串: '%s' =>\n", s.c_str()); // 输出原字符串

    // 反转字符串
    int len = s.length();
    int i, j;
    char temp;
    for (i = 0, j = len - 1; i < j; i++, j--) {
        temp = s[i];
        s[i] = s[j];
        s[j] = temp;
    }

    printf("反转后的字符串: '%s'\n", s.c_str()); // 输出反转后的字符串
}

// 主函数，选择题目
int main() {
    int choice;
    while (true) {
        printf("请选择功能:\n");
        printf("1. 可逆素数\n");
        printf("2. 计算数字总和\n");
        printf("3. 各位数字之和排序\n");
        printf("4. 字符串中的最大整数\n");
        printf("5. 字符串解压\n");
        printf("6. 输出指定图形\n");
        printf("7. 计算学生信息操作之最高分\n");
        printf("8. 字符串反转\n");
        printf("9. 退出\n");
        printf("请输入您的选择: ");
        scanf("%d", &choice);

        if (choice == 1) {
            fun1();
        } else if (choice == 2) {
            fun2();
        } else if (choice == 3) {
            fun3();
        } else if (choice == 4) {
            fun4();
        } else if (choice == 5) {
            fun5();
        } else if (choice == 6) {
            fun6();
        } else if (choice == 7) {
            fun7();
        } else if (choice == 8) {
            fun8();
        } else if (choice == 9) {
            break;
        } else {
            printf("无效输入，请重新选择。\n");
        }
    }
    return 0;
}