File handling in C

Question

I'm trying to use the fseek() and ftell() function to find the length of the file 'test.txt' which is present in the same directory as the file 'file.c'.

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file.c

#include <stdio.h>

int main()
{
    FILE *fp;
    int len;
    fp = fopen("test.txt", "r");

    if(fp == NULL)
    printf("Error opening file.");

    fseek(fp, 0, SEEK_END);
    len = ftell(fp);
    fclose(fp);
    printf("The size of the file test.txt is: %d.\n", len);

    return 0;  
}

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test.txt

abc def

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There is no problem when I compile the file, but when I try to run it, I'm getting the 'Segmentation fault (core dumped)' error abd the execution terminates.

What's going wrong in here?

Comments

Code is correct. Are you using some virtual machine? You can do gdb ./a.out and then type run. See what error you get.

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@Arjun

I am not using a virtual machine, though I am not logged on to a super user.

Actually I had not put a newline character \n after the error message here

 if(fp == NULL)
    printf("Error opening file.");

So I was not getting this message because of stream buffering of stdiout.

For some reason the file was not being accessible which got resolved when I created a new file instead of test.txt.

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should I study file handling for GATE CSE 2022?

Answer 1

Nice thanks

Shoviv