c中的簡單2d數組，分段故障（核心已轉儲）

Question

我的密碼

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

int main()
{
    int  i=0,totalNums,totalNum,j=0;
    size_t count;
    float numbers[20][100];
    char *line = malloc(100);

    FILE *myFile;
    myFile = fopen("vel.txt", "r");


    if (myFile == NULL)
    {
        printf("Error Reading File\n");
        exit (0);
    }

    while(getline(&line, &count, myFile)!=-1) {
        for (; count > 0; count--, j++)
            sscanf(line, "%f", &numbers[i][j]);
        i++;
    }

    totalNums = 100;
    totalNum = 20;
    for (i=0 ; i<totalNums ; i++) {
      for (j=0 ; j<totalNum ; j++) {
        printf("\n%f",  numbers[i][j]);
      }
    }
    fclose(myFile);
    return 0;
}

我的目標是讀取2D數組。 我的vel.txt

2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0
2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0 2900.0
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5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0
5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0
5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0 5400.0

我已經用gcc編譯了我的代碼，但是得到了：

milenko@milenko-HP-Compaq-6830s:~$ ./n1
Segmentation fault (core dumped)

為什么？

Answer 1

一些錯誤：

• float numbers[20][100]; 是20 x 100的數組。 這個：

   totalNums = 100; totalNum = 20; for (i=0 ; i<totalNums ; i++) { for (j=0 ; j<totalNum ; j++) { printf("\\n%f", numbers[i][j]); } } 

  迭代100 x 20數組。 使用比“ totalNums”更好的變量名（例如，諸如max_x和max_y類的東西）可能會消除此錯誤。

• count在使用前未初始化。 啟用編譯器警告。

• 您不會在任何地方free()變量line 。 實際上，這里根本沒有理由使用動態分配。

Answer 2

如下代碼：

while(getline(&line, &count, myFile)!=-1) {
    for (; count > 0; count--, j++)
        sscanf(line, "%f", &numbers[i][j]);
    i++;
}

將count **讀取的字節數**。 但是在下一行中，您將其視為要讀取的數字的數量 ...並且數字至少由2個字節組成（每個字符一個+空格一個）。

您應該嘗試使用諸如strtok功能讀取該行。 警告，此功能使用起來並不容易，請仔細閱讀文檔。

Answer 3

像這樣修復

size_t count=0;
float numbers[20][100];
char *line = NULL;

...

while(i < 20 && getline(&line, &count, myFile)!=-1) {
    int len = 0, pos = 0;
    j = 0;
    while(j < 100 && 1 == sscanf(line + pos, "%f%n", &numbers[i][j++], &len))
        pos += len;
    i++;
}
free(line);
totalNums = i;
totalNum = 100;//j;

Answer 4

調用getline之前，您的count未初始化，請嘗試以下操作：

size_t count = 100;
char *line = malloc(count);

while(getline(&line, &count, myFile)!=-1) { ... }