提示:文章
文章目录
- 前言
- 一、背景
- 二、
- 2.1
- 2.2
- 总结
前言
接上文HJ39判断两个IP是否属于同一子网
查了下,atoi可以转换负数。
修改成下面的代码
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>bool isTargetSonNet(int array[], int len)
{int tempArray[32] = {0};int tempArrayIndex = 0;for(int i = 0; i < len; i++){int data = array[i];if(data > 255 || data < 0){return false;}int index = ((tempArrayIndex + 1) * 8);while(data){int dat = data % 2;tempArray[--index] = dat;data /= 2;}tempArrayIndex++;}int count = 0;for(int i = 0; i + 1 < 32; i++){int temp = tempArray[i] - tempArray[i + 1];if(temp != 0 && temp != 1){return false;}if(temp == 1){count++;}}if(count != 1){return false;}return true;
}int main() {int a, b;char sonNet[20] = {'\0'};char ip1[20] = {'\0'};char ip2[20] = {'\0'};int arraySonNet[4] = {0};int arrayIp1[4] = {0};int arrayIp2[4] = {0};while (scanf("%s", sonNet) != EOF) { // 注意 while 处理多个 case// 64 位输出请用 printf("%lld") to char output = 'f';char delimiters[2] = ".";char* p = strtok(sonNet, delimiters);int index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);// if(data > 255)// {// output = '1';// break;// }// else if(data != 255 && data != 0)// {// output = '1';// break;// }arraySonNet[index++] = data;p = strtok(NULL, delimiters);}if(!isTargetSonNet(arraySonNet, 4)){output = '1';}if(output != 'f'){printf("%c\n", output);break;}if(scanf("%s", ip1) != EOF){p = strtok(ip1, delimiters);int index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);if(data > 255 || data < 0){output = '1';break;}arrayIp1[index++] = data;p = strtok(NULL, delimiters);}}if(output != 'f'){printf("%c\n", output);break;}if(scanf("%s", ip2) != EOF){p = strtok(ip2, delimiters);int index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);if(data > 255 || data < 0){output = '1';break;}arrayIp2[index++] = data;p = strtok(NULL, delimiters);}}if(output != 'f'){printf("%c\n", output);break;}int count = 0;for(int i = 0; i < 4; i++){if( (ip1[i] & sonNet[i]) == (ip2[i] & sonNet[i]) ){++count;}}if(output == 'f'){if(count == 4){output = '0';}else {output = '2';}}printf("%c\n", output);}return 0;
}
验证一下demo示例
示例有错误
255.255.255.0
192.168.224.256
192.168.10.4
255.0.0.0
193.194.202.15
232.43.7.59
255.255.255.0
192.168.0.254
192.168.0.1输出 1
修改成下面的代码也不行
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>bool isTargetSonNet(int array[], int len)
{int tempArray[32] = {0};int tempArrayIndex = 0;for(int i = 0; i < len; i++){int data = array[i];if(data > 255 || data < 0){return false;}int index = ((tempArrayIndex + 1) * 8);while(data){int dat = data % 2;tempArray[--index] = dat;data /= 2;}tempArrayIndex++;}int count = 0;for(int i = 0; i + 1 < 32; i++){int temp = tempArray[i] - tempArray[i + 1];if(temp != 0 && temp != 1){return false;}if(temp == 1){count++;}}if(count != 1){return false;}return true;
}int main() {int a, b;char sonNet[20] = {'\0'};char ip1[20] = {'\0'};char ip2[20] = {'\0'};int arraySonNet[4] = {0};int arrayIp1[4] = {0};int arrayIp2[4] = {0};while (scanf("%s", sonNet) != EOF) { // 注意 while 处理多个 case// 64 位输出请用 printf("%lld") to char output = 'f';char delimiters[2] = ".";char* p = strtok(sonNet, delimiters);int index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);// if(data > 255)// {// output = '1';// break;// }// else if(data != 255 && data != 0)// {// output = '1';// break;// }arraySonNet[index++] = data;p = strtok(NULL, delimiters);}if(!isTargetSonNet(arraySonNet, 4)){output = '1';}if(output != 'f'){printf("%c\n", output);break;}if(scanf("%s", ip1) != EOF){p = strtok(ip1, delimiters);int index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);if(data > 255 || data < 0){output = '1';break;}arrayIp1[index++] = data;p = strtok(NULL, delimiters);}}if(output != 'f'){printf("%c\n", output);continue;}if(scanf("%s", ip2) != EOF){p = strtok(ip2, delimiters);int index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);if(data > 255 || data < 0){output = '1';break;}arrayIp2[index++] = data;p = strtok(NULL, delimiters);}}if(output != 'f'){printf("%c\n", output);continue;}int count = 0;for(int i = 0; i < 4; i++){if( (ip1[i] & sonNet[i]) == (ip2[i] & sonNet[i]) ){++count;}}if(output == 'f'){if(count == 4){output = '0';}else {output = '2';}}printf("%c\n", output);}return 0;
}
示例有错误
255.255.255.0
192.168.224.256
192.168.10.4
255.0.0.0
193.194.202.15
232.43.7.59
255.255.255.0
192.168.0.254
192.168.0.1输出
1
1
2
0
修改代码,修改成goto,但是还是不行,会打印4个输出,很奇怪,我就调试。调试后我意识到goto会跳过其他scanf操作。
应该先把数据采集完在处理。
总结
接下文:HJ39判断两个IP是否属于同一子网(下)