C语言逆序排列在算法设计中的应用

在算法设计中，逆序排列是一种常见的操作。它可以应用于各种数据结构和场景，例如数组、链表、字符串等。下面是一些使用C语言实现逆序排列的示例：

1. 逆序排列数组：

#include<stdio.h>

void reverseArray(int arr[], int start, int end) {
    int temp;
    while (start < end) {
        temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int n = sizeof(arr) / sizeof(arr[0]);

    printf("Original array: ");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    reverseArray(arr, 0, n - 1);

    printf("Reversed array: ");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}

2. 逆序排列链表：

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

struct Node {
    int data;
    struct Node* next;
};

struct Node* reverseList(struct Node* head) {
    struct Node *prev = NULL;
    struct Node *current = head;
    struct Node *next = NULL;

    while (current != NULL) {
        next = current->next;
        current->next = prev;
        prev = current;
        current = next;
    }

    return prev;
}

void printList(struct Node* head) {
    while (head != NULL) {
        printf("%d -> ", head->data);
        head = head->next;
    }
    printf("NULL\n");
}

int main() {
    struct Node* head = NULL;
    struct Node* temp;
    int arr[] = {1, 2, 3, 4, 5};
    int n = sizeof(arr) / sizeof(arr[0]);

    for (int i = n - 1; i >= 0; i--) {
        temp = (struct Node*)malloc(sizeof(struct Node));
        temp->data = arr[i];
        temp->next = head;
        head = temp;
    }

    printf("Original list: ");
    printList(head);

    head = reverseList(head);

    printf("Reversed list: ");
    printList(head);

    return 0;
}

3. 逆序排列字符串：

#include<stdio.h>
#include<string.h>

void reverseString(char* str) {
    int len = strlen(str);
    char temp;

    for (int i = 0; i < len / 2; i++) {
        temp = str[i];
        str[i] = str[len - 1 - i];
        str[len - 1 - i] = temp;
    }
}

int main() {
    char str[] = "Hello, world!";

    printf("Original string: %s\n", str);

    reverseString(str);

    printf("Reversed string: %s\n", str);

    return 0;
}

这些示例展示了如何在C语言中实现逆序排列。你可以根据需要修改这些代码以适应不同的数据结构和场景。