GDB keeps thinking that x and y remain the same no matter what i do | Together C & C++ | Page 1

manic summit Oct 27, 2024, 5:58 PM

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#include <stdio.h>

int rotateRight(int x, int n) {
    int rotation = x >> n;
    int bits = x << (32 - n);
    int mask = rotation | bits;
    return mask;
}

void main() {
    int xi = 0x80000000;
    int ni = 1;
    int rotate = rotateRight(xi, ni);
    printf("%d", rotate);
}```

fluid raptorBOT Oct 27, 2024, 5:58 PM

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manic summit Oct 27, 2024, 6:00 PM

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the debugger thinks it's these two values

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when i deleted that, like, a long time ago

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i changed the variable names, even.

molten hemlock Oct 27, 2024, 6:25 PM

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probably you are debugging wrong executable

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exit gdb, remove file, recompile

manic summit Oct 27, 2024, 6:27 PM

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What does that mean? Like using gcc?

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I exited gdb and recompiled it, and got the same result

urban sparrow Oct 27, 2024, 6:41 PM

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Did you forget to save the file?

molten hemlock Oct 27, 2024, 6:57 PM

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manic summit I exited gdb and recompiled it, and got the same result

I hope you frist removed the exact path you pass to gdb

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and yes, save the file

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there's usually no magic, if I got a penny each time someone didn't save file or used different path when testing than the target path for building, I would be soooo rich :)

manic summit Oct 28, 2024, 1:49 AM

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molten hemlock I hope you frist removed the exact path you pass to gdb

how do you do that?

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have legit no idea what you mean

manic summit Oct 28, 2024, 2:00 AM

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urban sparrow Did you forget to save the file?

no i did not

molten hemlock Oct 28, 2024, 2:22 AM

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is that windows or linux?

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if windows, is that mingw or wsl?

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are you running gdb yourself from terminal or is it done via some gui?

manic summit Oct 28, 2024, 2:24 AM

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i'm running it from windows, but running it on a linux machine virtually (through a secure connection)

molten hemlock Oct 28, 2024, 2:26 AM

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how many questions have you seen?

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(because I see answer missing)

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well, either focused and fast and interactive or I won't be able to help you

manic summit Oct 28, 2024, 2:29 AM

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it's mainly because i don't know the answer to some of your questions, mainly whether its mingw or wsl

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i assume wsl is a linux compiler

molten hemlock Oct 28, 2024, 2:29 AM

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it isn't windows

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it is linux

manic summit Oct 28, 2024, 2:29 AM

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and mingw is a windows compiler

molten hemlock Oct 28, 2024, 2:29 AM

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if this is a virtual machine

manic summit Oct 28, 2024, 2:29 AM

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it is

molten hemlock Oct 28, 2024, 2:29 AM

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so that one is irrelevant

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do you run gdb from console, typing a command?

manic summit Oct 28, 2024, 2:30 AM

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the console on my actual computer (not the linux one) or within the virtual machine?

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because the answer is within the virtual machine

molten hemlock Oct 28, 2024, 2:30 AM

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that's what I would normally guess (even though technicaly it would be possible to do it otherwise)

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what exact command do you use to run gdb?

manic summit Oct 28, 2024, 2:31 AM

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gdb -tui (once i'm within the directory of the c file)

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after using gcc of course

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gcc -g test.c (what i use to compile)

molten hemlock Oct 28, 2024, 2:32 AM

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so how do you then choose executable to debug?

manic summit Oct 28, 2024, 2:32 AM

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file test

molten hemlock Oct 28, 2024, 2:32 AM

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then it won't work, because above gcc produced file a.out

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and not test

manic summit Oct 28, 2024, 2:32 AM

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ah

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so i have to choose the output file?

molten hemlock Oct 28, 2024, 2:33 AM

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yes, the default name is a.out, so either you debug that, or you wite gcc -g test.c -o test

manic summit Oct 28, 2024, 2:34 AM

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ah

molten hemlock Oct 28, 2024, 2:34 AM

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generally it is convenient to know commands like ls -l or stat to be able to see what's the file date, or even ls -lt to see files sorted by date, and I was going into direction of telling you to remove test like rm test, but as you have shown already you are not recompiling that, that's no longer important

manic summit Oct 28, 2024, 2:34 AM

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i should've remembered this

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i've done this before.

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shit memory.

molten hemlock Oct 28, 2024, 2:35 AM

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you see, as always, program not recompiled

manic summit Oct 28, 2024, 2:37 AM

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that includes human memories, apparently

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anyways, thanks.

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!solved

fluid raptorBOT Oct 28, 2024, 2:37 AM

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Thank you and let us know if you have any more questions!

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manic summit Oct 28, 2024, 2:38 AM

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i'm also literally going to put this in my class notes so i don't forget again (the literal screenshot of this convo)

#GDB keeps thinking that x and y remain the same no matter what i do