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I was surprised to see that below code works in C++.

int n;
cin >> n;
int arr[n];

which is violating most of the information available on internet in this context, that, array size should be compile time known. Is the above feature/behavior is universally rolled out and accepted, or it is just compiler dependent or C++ language version dependent?

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  • it's VLA (variable-length array), a commonly-supported extension, since it is a part of the C standard, but not C++. Commented Jul 2, 2021 at 10:42
  • It is compiler dependent, but pretty common. GCC and Clang for example accept to create VLA by default, but not in their -pedantic mode. Commented Jul 2, 2021 at 10:50
  • fwiw, there was a proposal to have something similar to VLAs in C++ (i think it was C++14), but it wasn't accepted eventually Commented Jul 2, 2021 at 11:19
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