堆栈内存溢出
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c中的简单2d数组，分段故障（核心已转储）

[英]Simple 2d array in c,Segmentation fault (core dumped)

 原文  2016-05-02 13:57:12  2   4    c/ file

问题描述

My code 我的密码 

#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;
}

My goal is to read 2d array. 我的目标是读取2D数组。 My vel.txt 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
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

I have compiled with gcc my code but I got : 我已经用gcc编译了我的代码，但是得到了： 

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

Why? 为什么？

4 个解决方案

解决方案1
 4  2016-05-02 14:11:14

Some bugs: 一些错误：

  • float numbers[20][100]; is a 20 x 100 array. 是20 x 100的数组。 This: 这个： 

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

    iterates over a 100 x 20 array. 迭代100 x 20数组。 The use of better variable names than "totalNums" (for example something like max_x and max_y ) would likely have eliminated this bug. 使用比“ totalNums”更好的变量名（例如，诸如max_x和max_y类的东西）可能会消除此错误。

  • count is uninitialized before use. count在使用前未初始化。 Enable compiler warnings. 启用编译器警告。

  • You don't free() the variable line anywhere. 您不会在任何地方free()变量line 。 Actually there is no reason to use dynamic allocation here at all. 实际上，这里根本没有理由使用动态分配。

解决方案2
 2  2016-05-02 14:02:46

The following code: 如下代码： 

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

Will put in count the** number of bytes read**. 将count **读取的字节数**。 But in next line, you consider it as the number of numbers to read ... And on number is at least composed of 2 bytes (one per character + one for the space). 但是在下一行中，您将其视为要读取的数字的数量 ...并且数字至少由2个字节组成（每个字符一个+空格一个）。

You should try to read the line with some function like strtok . 您应该尝试使用诸如strtok功能读取该行。 Warning, this function is not so trivial to use, read carrefully the documentation. 警告，此功能使用起来并不容易，请仔细阅读文档。

解决方案3
 2 已采纳  2016-05-02 14:21:23

fix like this 像这样修复 

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;

解决方案4
 1  2016-05-02 14:03:01

Your count is not initialized before calling getline , try this: 调用getline之前，您的count未初始化，请尝试以下操作： 

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

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

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