注意输出格式：十六进制不足两位要补零

#include<iostream>
#include<cstring>
#include<cstdlib>
using namespace std;
const int M = 1024;
int main()
{
	char line[M], tmp[20];
	int ip[8];
	int count = 0;
	cin.getline(line, M);
	int i = 0, head = 0, len = 0;
	bool flag = true;//是否合法 
	while (line[i]) {
		if (line[i] >= '0' && line[i] <= '9') {
			len++;
		}
		else if (line[i] == '.') {
			memset(tmp, 0, sizeof(tmp));
			strncpy(tmp, line+head, len);
			head = i + 1;
			len = 0;
			int num = atoi(tmp);
			if (num < 0 || num > 255) {
				flag = false;
				break;
			}
			else {
				ip[count++] = num;
				if (count > 4) {
					flag = false;
					break;
				}
			}
		}
		else {
			flag = false;
			break;
		}
		i++;
	}
	memset(tmp, 0, sizeof(tmp));
	strncpy(tmp, line+head, len);
	int num = atoi(tmp);
	if (num < 0 || num > 255) {
		flag = false;
	}
	else {
		ip[count++] = num;
		if (count > 4) {
			flag = false;...