Hey guys Idk why when i creat a new file and i write on it when i try to read from by program the pointer always stay in null va

Question

#include<stdio.h>
#include<stdlib.h>
void prenom(){
char c[20];
FILE *f=fopen("ex.txt","r");
if (f==NULL)
perror("error");
fgets(c,20,f);
printf("%s",c);
fclose(f);
}
int main(){
prenom();
}

Answer 1

Isho thank you very much it worked can u please give me a lesson or video to clearify that thing more and ll apperciated it

Answer 2

The code (copy-pasted) is working for me.

Make sure the file 'ex.txt' exists and is in the same directory as your exe file (assuming you're on Windows).

Answer 3

The file must be next to the exe for this to work.

File paths are relative to the program's working directory which, when double-clicking the exe, is the same as the exe directory.

So, yeah, put the text file next to the exe and it should work.

Answer 4

Here are a couple of articles on Wikipedia that briefly touch the subject:

Working directory: https://en.wikipedia.org/wiki/Working_directory
Paths: https://en.wikipedia.org/wiki/Path_(computing) also contains a brief comparison between relative vs absolute paths.

Though a good way to get comfortable with file paths is to use a terminal/console/cmd/call it whatever for a while. Learning file manipulation through the command line (powershell, for example) will help a lot, since you'll have to actually type the paths in (correctly!) instead of relying on the GUI to figure that out.

Answer 5

Isho Acctually the file is in desktop and exe one in documents does it influence on my program?

Answer 6

Which thing? working directory? relative paths?

Answer 7

@Isho both if u can