#include stdioh#include stdlibh 定义最大数组长度#define MAX_SIZE 100 归并排序合并函数void mergeint arr int left int mid int right int i j k; int n1 = mid - left + 1; int n2 = right - mid; 临时数组 int L

The code you provided has compilation errors because the fopen_s function in C requires three arguments, not two. The correct syntax for fopen_s is fopen_s(&file, filename, mode), where file is a file pointer, filename is the name of the file, and mode is the mode in which the file should be opened.

Here's the modified code with the correct usage of fopen_s:

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

// 定义最大数组长度
#define MAX_SIZE 100

// 归并排序合并函数
void merge(int arr[], int left, int mid, int right) {
    int i, j, k;
    int n1 = mid - left + 1;
    int n2 = right - mid;

    // 临时数组
    int* L = (int*)malloc(n1 * sizeof(int));
    int* R = (int*)malloc(n2 * sizeof(int));

    // 将数据分别复制到临时数组中
    for (i = 0; i < n1; i++)
        L[i] = arr[left + i];
    for (j = 0; j < n2; j++)
        R[j] = arr[mid + 1 + j];

    // 归并临时到原数组中
    i = 0;  //子数组的起始索引
    j = 0;  // 右数组的起始索引    k = left; // 合并后的数组的起始索引
    while (i < n1 && j < n2) {
        if (L[i] <= R[j]) {
            arr[k] = L[i];
            i++;
        }
        else {
            arr[k] = R[j];
            j++;
        }
        k++;
    }

    // 处理剩余元素
    while (i < n1) {
        arr[k] = L[i];
        i++;
        k++;
    }
    while (j < n2) {
        arr[k] = R[j];
        j++;
        k++;
    }

    // 释放临时数组的内存
    free(L);
    free(R);
}

// 归并排序函数
void mergeSort(int arr[], int left, int right) {
    if (left < right) {
        int mid = left + (right - left) / 2;

        // 分割数组
        mergeSort(arr, left, mid);
        mergeSort(arr, mid + 1, right);

        // 合并数组
        merge(arr, left, mid, right);
    }
}

// 外部排序函数
void externalSort(int arr[], int size) {
    // 创建临时文件
    FILE* tempFile;
    if (fopen_s(&tempFile, "temp.txt", "w") != 0) {
        printf("Failed to create temp file.\n");
        return;
    }

    // 将数据写入临时文件
    for (int i = 0; i < size; i++) {
        fprintf(tempFile, "%d ", arr[i]);
    }

    // 关闭文件
    fclose(tempFile);

    // 读取临时文件并排序
    FILE* inputFile;
    if (fopen_s(&inputFile, "temp.txt", "r") != 0) {
        printf("Failed to open temp file.\n");
        return;
    }
    int tempArr[MAX_SIZE];
    int count = 0;

    while (!feof(inputFile)) {
        fscanf_s(inputFile, "%d", &tempArr[count]);
        count++;
    }

    // 关闭文件
    fclose(inputFile);

    // 删除临时文件
    remove("temp.txt");

    // 对临时数组进行排序
    mergeSort(tempArr, 0, count - 1);

    // 输出排序结果
    printf("排序结果：\n");
    for (int i = 0; i < count; i++) {
        printf("%d ", tempArr[i]);
    }
}

int main() {
    int arr[] = { 51, 49, 39, 46, 38, 29, 14, 61, 15, 30, 1, 48, 52, 3, 63, 27, 4, 13, 89, 24, 46, 58, 33, 76 };
    int size = sizeof(arr) / sizeof(arr[0]);

    // 外部排序
    externalSort(arr, size);

    return 0;
}

Please note that the fopen_s function is a Windows-specific secure version of fopen. If you are using a different operating system or compiler, you may need to use a different function to open files securely