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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

Posts tagged undefined-behavior

The unpredictable outcome of compiling or executing a program caused by breaking a language rule that is not enforced at compile or runtime.

This tag doesn't have a detailed wiki yet.

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Q&A Can I access an array element from a pointer to an object contiguous with but outside the array?

C prohibits accessing an array out of bounds even if measures were taken to ensure that what should lie outside those bounds were known: struct MyStruct { int x[2]; int y, z; }; static...

1 answer  ·  posted 21d ago by CPlus‭  ·  last activity 19d ago by Lundin‭

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Q&A Behavior of Pointer Arithmetic on the Stack

Consider the following code: #include <stdio.h> int main() { int a = 5; int b; ++*(&b + 1); printf("%d\n", a); return 0; } The output is as expected: 6 ...

4 answers  ·  posted 2y ago by Josh Hyatt‭  ·  last activity 2y ago by Alexei‭

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Q&A Why can't we mix increment operators like i++ with other operators?

I'm experimenting with different operators and have a hard time understanding the outcome of certain expressions. I try to combine the ++ operators with other operators such as assignment in the sa...

1 answer  ·  posted 3y ago by Lundin‭  ·  last activity 3y ago by Lundin‭

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Q&A What is undefined behavior and how does it work?

I have created this sensational program: #include <stdio.h> int* func (void) { int local=5; return &local; } int main (void) { printf("%d\n", *func()); } This prints 5 even thoug...

1 answer  ·  posted 3y ago by Lundin‭  ·  last activity 3y ago by Lundin‭

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Q&A Is it undefined behaviour to just make a pointer point outside boundaries of an array without dereferencing it?

I have heard that it is undefined behaviour to make a pointer point outside boundaries of an array even without dereferencing it. Can that really be true? Consider this code: int main(void) { ...

2 answers  ·  posted 3y ago by klutt‭  ·  last activity 3y ago by hkotsubo‭