Array of size defined by not constant variable

Question

There is such code:

#include 

int main()
{
  int size;
  std::cin >> size;

  size = size + 1;
  int tab3[size];

  tab3[0] = 5;
  std         


        

Answer 1

It is a C99 feature, not a part of C++. They are commonly refered to as VLAs(Variable Length Arrays.

If you run g++ with -pedantic it will be rejected.

See GCC docs for more info.

See also: VLAs are evil.