用C语言设计一个文本菜单交互界面的程序，该程序能够实现以下功能： 1. 用户可以输入若干个整数（可能有重复数）； 2. 设计文本菜单供用户进行功能选择； 3. 实现数字排序、求出数字的和、求出数字的积等理论课中展示过的功能； 4. 自行设计其他功能（如求取最大、最小值等）。

在C语言中设计一个文本菜单交互界面的程序，你可以按照以下步骤来进行：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

// 定义全局变量存储数据
int *numbers;
int num_count = 0;

// 功能函数
void add_numbers(int* arr, int count) {
    int sum = 0;
    for (int i = 0; i < count; i++) {
        sum += arr[i];
    }
    printf("Sum of the numbers is: %d\n", sum);
}

void multiply_numbers(int* arr, int count) {
    int product = 1;
    for (int i = 0; i < count; i++) {
        product *= arr[i];
    }
    printf("Product of the numbers is: %d\n", product);
}

void sort_numbers(int* arr, int count) {
    // 使用冒泡排序算法
    for (int i = 0; i < count - 1; i++) {
        for (int j = 0; j < count - 1 - i; j++) {
            if (arr[j] > arr[j + 1]) {
                int temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
    printf("Sorted numbers are: ");
    for (int i = 0; i < count; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");
}

// 文本菜单
void menu() {
    printf("Menu:\n");
    printf("1. Add numbers\n");
    printf("2. Multiply numbers\n");
    printf("3. Sort numbers\n");
    printf("4. Find maximum number\n");
    printf("5. Find minimum number\n");
    printf("6. Exit\n");
    int choice;
    scanf("%d", &choice);
    switch (choice) {
        case 1: add_numbers(numbers, num_count); break;
        case 2: multiply_numbers(numbers, num_count); break;
        case 3: sort_numbers(numbers, num_count); break;
        case 4: printf("Maximum number is: %d\n", *(std::max_element(numbers, numbers + num_count))); break;
        case 5: printf("Minimum number is: %d\n", *(std::min_element(numbers, numbers + num_count))); break;
        case 6: exit(0); // 退出程序
        default: printf("Invalid choice. Please try again.\n");
    }
}

int main() {
    srand(time(NULL));
    while (true) {
        printf("Enter integers (type 'q' to quit): ");
        char input[50];
        fgets(input, sizeof(input), stdin);
        if (strcmp(input, "q") == 0) {
            free(numbers);
            return 0;
        }

        // 分割字符串为整数并添加到数组中
        char* token = strtok(input, " ");
        while (token != NULL) {
            int num = atoi(token);
            numbers = realloc(numbers, (num_count + 1) * sizeof(int));
            numbers[num_count++] = num;
            token = strtok(NULL, " ");
        }

        menu();
    }
}