c - 对 C 中字符串数组的最后一列进行排序

Question

我有一个 .txt 文件，其中包含以下内容:

1    - Ground   2
2    - Ground   7
3    - City     1
4    - Hill     x
5    - City     3
6    - City     4
7    - Hill     6

任务是以特定顺序对这些游戏槽位进行排序:文件的第一列是槽位编号，第二列是槽位编号文件的列是插槽类型，文件的第三列是相关插槽右侧的插槽编号.

x意味着该槽位的右侧没有槽位，因此这意味着槽位 4(山)是有序槽位中的最后一个槽位。因此程序必须搜索文本文件以找到 x然后查看该行上的插槽编号，看看该行左侧的插槽是什么。完成此操作后，它应该输出以下内容:

(5,City)->(3, City)->(1, Ground)->(2,Ground)->(7,Hill)->(6,City)->(4,Hill)

这是我到目前为止的代码:

此代码读取文本文件并打印初始的槽列表。任何帮助将不胜感激。谢谢。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

const char *SLOTS_FILE_PATH = "slots.txt";

char slotsArr[7][100];
char newSlots[7][100];

int main()
{
     int i = 0;
     int j;
     char search;

     FILE *fx = fopen(SLOTS_FILE_PATH, "r+");   

         if (fx == NULL)
         {
            perror("Error opening slots file");
            i = -1;
         }
         else
         {
             while(fgets(slotsArr[i],
             sizeof(slotsArr[i]), fx) != NULL)
         {
             i++;
         }

             fclose (fx);
         }

     printf("\n-------Initial List of Slots-------\n");

     for (j = 0; j < i; j++)
     {
         printf("%s", slotsArr[j]);
     }

     printf("\n-------Sorted List of Slots-------\n");

     }

************************这就是它的输出******************** *****

 -------Initial List of Slots-------
 1  - Ground    2
 2  - Ground    7
 3  - City      1
 4  - Hill      x
 5  - City      3
 6  - City      4
 7  - Hill      6

 -------Sorted List of Slots-------

Answer 1

在我的浏览器中输入的，所以会有拼写错误。 (我一只手上有绷带……)但是，一个指针:

char slotsArr[7][100];
char newSlots[7][100];
…

// It starts with x
char charToSearch = 'x'; // It doesn't matter, whether it is a digit or char. 
int sortedIndex = 7; // Start at the right side.
while( sortedIndex>0 )
{
  // search for the row by iterating over the array and comparing the last letter.
  for( int unsortedIndex=6; unsortedIndex>=0; unsortedIndex-- )
  {
    if( charToSearch == slotsArr[unsortedIndex][16] )
    {
      charToSearch = slotsArr[unsortedIndex][0]; // The next item's index
      sortedIndex--;
      // The format of the result array is not clear in your Q. 
      // However, this is not the problem. I put a number and the trimmed 
      // string into it. You can add the parenthesis and the - at output, 
      // if you want to.
      newSlots[sortedIndex][0]=charToSearch;
      newSlots[sortedIndex][1]=',';

      // Copy the string up to a space
      char src = slotsArray[unsortedIndex]+7;
      char *dest = newSlots[sortedIndex]+2;
      while( !isspace(src) )
      {
        *dst++ = *src++;
      }
      *dst='\0';
      break;
    }
  }
}