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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(中)

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先全部获取完输入再处理数据

#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 caseif(strlen(sonNet) < 4){return 0;}// 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'){goto RESULT;}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'){goto RESULT;}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'){goto RESULT;}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';}}RESULT:printf("%c\n", output);}return 0;
}

最终修改成如下的代码，全部通过实例，Ace了。

#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 scanf("%s", ip1);scanf("%s", ip2);char output = 'f';char delimiters[2] = ".";char* p = strtok(sonNet, delimiters);int index = 0;while(p != NULL){int data = atoi(p);arraySonNet[index++] = data;p = strtok(NULL, delimiters);}if(!isTargetSonNet(arraySonNet, 4)){output = '1';goto RESULT;}p = strtok(ip1, delimiters);index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);if(data > 255 || data < 0){output = '1';goto RESULT;}arrayIp1[index++] = data;p = strtok(NULL, delimiters);}p = strtok(ip2, delimiters);index = 0;while(p != NULL){//printf("%s\n", p);int data = atoi(p);if(data > 255 || data < 0){output = '1';goto RESULT;}arrayIp2[index++] = data;p = strtok(NULL, delimiters);}int count = 0;for(int i = 0; i < 4; i++){if( (ip1[i] & sonNet[i]) == (ip2[i] & sonNet[i]) ){++count;}}if(count == 4){output = '0';}else {output = '2';}RESULT:printf("%c\n", output);}return 0;
}

3、总结

3.1 atoi可以转换带符号变量

3.2 strtok写法一开始不会写了

3.3 掩码网络号的处理

3.4 使用了goto语句，是否还有其他好的解决方法。

三、

3.1

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总结

未完待续