What does the function with such syntax mean .. A (int i):i (++i){}

Answer 1

It means that there's a function whose argument is i then it assigns i=++i

Answer 2

@Gordie .that explaination suits my piece of code.
Also been there some func. like a(0) post ':' it would have called a() by passing 0 in it.Is that right ?

Answer 3

It means that the function assigns a=0