What will this do? C++

Question

void main()
{
    int const *p=5;
    cout<<++(*p);
}

What will this do? Is it wrong and if so, why? Please make me understand. Thank you!

It will get you downvotes mostly. To avoid those in the future you should take [the tour](http://stackoverflow.com/tour) and read the [help page](http://stackoverflow.com/help). Here is [The Definitive C++ Book Guide and List](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list). — , Jan 29 '17 at 23:57
What does your compiler say when you try to compile this piece of code? — Igor Tandetnik, Jan 30 '17 at 00:03
_What did i do wrong?_ Well.. For starters - you didn't do _any_ research before asking here. — Algirdas Preidžius, Jan 30 '17 at 01:26

score 2 · Answer 1 · answered Jan 30 '17 at 01:30

What will this do?

The program is ill-formed and may refuse to compile. If it compiles, the behaviour is not specified by the standard.

Is it wrong and if so, why?

It is. Because:

error: '::main' must return 'int'
error: invalid conversion from 'int' to 'const int*'
error: 'cout' was not declared in this scope
error: increment of read-only location '* p'

What will this do? C++

1 Answers1