Constructor of type int

Question

Considering the cost, are these cases the same?

// case 1
int a = 5;

// case 2
int a (5);

// case 3
int a;
a = 5

Answer 1

First and second are exactly same as both are initialization. Third one is different, as this is assignment. These differences are as per the C++ Standard. However, the compiler can treat all three as same!