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

Question

My code

#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. My 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 :

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

Why?

Answer 1

Some bugs:

• float numbers[20][100]; is a 20 x 100 array. This:

   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. The use of better variable names than "totalNums" (for example something like max_x and max_y ) would likely have eliminated this bug.

• count is uninitialized before use. Enable compiler warnings.

• You don't free() the variable line anywhere. Actually there is no reason to use dynamic allocation here at all.

Answer 2

The following code:

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**. 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).

You should try to read the line with some function like strtok . Warning, this function is not so trivial to use, read carrefully the documentation.

Answer 3

fix like this

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

Your count is not initialized before calling getline , try this:

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

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