Defining a variable in the condition part of an if-statement?

Question

I was just shocked, that this is allowed:

if( int* x = new int( 20 ) )
{
    std::cout << *x << \"!\\n\";
    // delete x;
}
else
{
    std::cout         


        

Answer 1

It is standard, even in the old C++ 98 version of the language: