ByTalbor
Hello! I wanted to write a program that reads data from a .txt file and then uses it.
Why does a single call to fscanf work in a loop, but not twice like this?
Why can't I call the function one after the other without a loop? I'd really like to store everything in a struct.
(1 votes)
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You don’t know how big the read-in string is, so you may provoke an overflow, you’ll have a vulnerability.
In addition, you should thirst a bug treatment if something goes wrong.
Whether the cause of your problem is can’t be said, but it definitely helps with troubleshooting.
For more information, see here:
https://pubs.opengroup.org/onlinepubs/000095399/functions/fscanf.html
To do what the error code means and what the function does exactly.
Also gives features that allow you to generate a matching error message or to limit the length of the input.
You’re right! But I’m still learning, so I’m focusing on the basics. ^^
I actually found the mistake elsewhere, that was in the struct. As soon as I made arrays from the variables, it was even though I couldn’t fully understand. But it goes. xD
error treatment is a basis. In C, even one of the most important ones, because there are so easy mistakes and without fault treatment, they are barely easy to handle.
In addition, you should see that when compiling, the compiler is pedantic (-pedantic) and also treats you with warnings like mistakes (-Wall-Werror). If necessary, it would also be appropriate to set a C standard that the compiler should use (e.g. -std=c11 -D_XOPEN_SOURCE=700).
In addition, Debug symbols should be enabled. Total:
That’s unfavourable in C. And I’m just getting a few mistakes you could have made.
Specifically: In Structs only the last element may have a dynamic size, the rest must have a fixed size.
If you want to place two strings in a struct, at least one of them must have a fixed maximum size.
Mine broke. xD
Integer and char isr comparatively simple. But as soon as you read a string it becomes complicated;-)
Remember me when we first read strings, that was extremely complicated if you wanted it not to break.
Yeah, that’s right.
If I have everything, it’s for university assignments on C89 that’s why I’m doing it.
I wanted to save an integer. 😮 Then I made it all too sharp. Something like that. Didn’t have it right now.