请帮我使用C语言写一个扫描局域网的代码。

我可以回答这个问题。以下是一个基于C语言的扫描局域网的代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main()
{
    int sockfd, ret, i;
    struct sockaddr_in addr;
    char ip[15];
    char subnet[15];
    char *p;

    printf("Please enter the subnet (ex. 192.168.0): ");
    scanf("%s", subnet);

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        exit(1);
    }

    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(0);
    addr.sin_addr.s_addr = inet_addr("192.168.0.1");

    ret = bind(sockfd, (struct sockaddr *)&addr, sizeof(addr));
    if (ret < 0) {
        perror("bind");
        exit(1);
    }

    for (i = 1; i < 255; i++) {
        sprintf(ip, "%s.%d", subnet, i);
        addr.sin_addr.s_addr = inet_addr(ip);
        ret = sendto(sockfd, NULL, 0, 0, (struct sockaddr *)&addr, sizeof(addr));
        if (ret < 0) {
            perror("sendto");
        } else {
            printf("%s\n", ip);
        }
    }

    close(sockfd);
    exit(0);
}