undefined-behavior

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Following C code compiles and runs, but is it undefined bahaviour?
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undefined-behavior pointers c
Is it UB to return a pointer to local variable?
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202
dangling-pointer undefined-behavior language-lawyer pointers c
Union with const and non-const members
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240
undefined-behavior language-lawyer unions pointers c
Polymorphic update on struct fields in Rust
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118
rust undefined-behavior unsafe
Is there a way to reliably malloc the same block of memory as a previously freed block, then access the content that was previously in it?
user_8304310
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99
dynamic-memory-allocation free undefined-behavior malloc c
Does sscanf require a null terminated string as input?
user_45932670
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1667
undefined-behavior language-lawyer scanf c
Is returning from a noreturn function undefined behavior, if it returns with a call to another noreturn function?
Admin1
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134
noreturn undefined-behavior c++
Why is gcc-multilib output incorrect for bitwise operation?
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61
undefined-behavior integer-overflow bit-manipulation gcc c
Any reason why 0.0/0.0 makes negative nan in C++?
user_151593440
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242
undefined-behavior nan c++
It it UB to read some contiguous array cells as a larger type?
user_112696570
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59
undefined-behavior arrays c++
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