Default initialization in C++

Question

I was asking myself something this morning, and I can\'t find the words to properly \"google\" for it:

Lets say I have:

struct Foo
{
  int bar;
};

s         


        

Answer 1

Since bar is a built-in type its default initialization will be undefined for Foo1 and Foo2. If it would have been a custom type, then the default constructor would have been called, but here it's not the case.

Lesson: always initialize your variables.