华为面试题：识别有效的ip地址和子网掩码并分类 C语言源码

来源：互联网发布：淘宝恶意退款不退货编辑：程序博客网时间：2024/04/28 20:49

识别有效的ip地址和子网掩码并分类：按行输入多组数据 10.8.9.2~255.0.0.0180.8.9.2~255.254.0.0打印：A B C D E 错误的ip或掩码 私有ip  的个数#include "stdio.h"#include "stdlib.h"#include "string.h"#define MAX_PATH 256int maze[10][10] = {0};int route[100][2] = {0};int impl(char *ip,char *mask,int *privateIp){char *a = strtok(ip,".");char *b = strtok(NULL,".");char *c = strtok(NULL,".");char *d = strtok(NULL,".");if (!(a && b && c && d)){return 5;}int ai = atoi(a);int bi = atoi(b);int ci = atoi(c);int di = atoi(d);// char *a1 = strtok(mask,".");// char *b1 = strtok(NULL,".");// char *c1 = strtok(NULL,".");// char *d1 = strtok(NULL,".");if(ai>0 && ai<=126 && strcmp(mask,"255.0.0.0")==0){if (ai==10 && bi>=0 && bi<=255){*privateIp = 1;}return 0;}else if(ai>=128 && ai<=191 && strcmp(mask,"255.255.0.0")==0){if (ai==172 && bi>=16 && bi<=31){*privateIp = 1;}return 1;}else if(ai>=192 && ai<=223 && strcmp(mask,"255.255.255.0")==0){if (ai==192 && bi==168){*privateIp = 1;}return 2;}else if(ai>=224 && ai<=239){return 3;}else if(ai>=240 && ai<=255){return 4;}else{return 5;}}int main(){// char test[4][100]={"10.70.44.68~255.254.255.0",// "1.0.0.1~255.0.0.0",// "192.168.0.2~255.255.255.0",// "19..0.~255.255.255.0"};int result[7] = {0};char test[100] = {0};while(scanf("%s",test)!=EOF){char *ip = strtok(test,"~");char *mask = strtok(NULL,"~");int n = impl(ip,mask,&result[6]);result[n]++;}// for (int i=0;i<4;i++)// {// char *ip = strtok(test[i],"~");// char *mask = strtok(NULL,"~");// int n = impl(ip,mask,&result[6]);// result[n]++;// }for (int i=0;i<7;i++){printf("%d ",result[i]);}return 0;}

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