在C語言中，要對結構體數組進行逆序排序，你可以使用以下方法：

1. 首先定義一個結構體類型，例如：

typedef struct {
    int id;
    char name[50];
} Student;

2. 創建一個結構體數組并填充數據：

Student students[] = {
    {1, "Alice"},
    {2, "Bob"},
    {3, "Charlie"},
    {4, "David"}
};
int n = sizeof(students) / sizeof(students[0]); // 計算數組長度

3. 編寫一個交換結構體元素的函數：

void swap(Student *a, Student *b) {
    Student temp = *a;
    *a = *b;
    *b = temp;
}

4. 使用循環逆序排序結構體數組：

for (int i = 0; i < n / 2; i++) {
    swap(&students[i], &students[n - 1 - i]);
}

5. 打印逆序排序后的結構體數組：

for (int i = 0; i < n; i++) {
    printf("ID: %d, Name: %s\n", students[i].id, students[i].name);
}

完整代碼示例：

#include<stdio.h>

typedef struct {
    int id;
    char name[50];
} Student;

void swap(Student *a, Student *b) {
    Student temp = *a;
    *a = *b;
    *b = temp;
}

int main() {
    Student students[] = {
        {1, "Alice"},
        {2, "Bob"},
        {3, "Charlie"},
        {4, "David"}
    };
    int n = sizeof(students) / sizeof(students[0]);

    for (int i = 0; i < n / 2; i++) {
        swap(&students[i], &students[n - 1 - i]);
    }

    for (int i = 0; i < n; i++) {
        printf("ID: %d, Name: %s\n", students[i].id, students[i].name);
    }

    return 0;
}

運行此代碼將輸出逆序排序后的結構體數組。