C++ declaring a variable twice

Question

Hello everyone I am learning about the declaration of variables in C++.

Now please tell me my mistake here. Why is it bad to declare your variable twice?

int fly = 0; for(int fly = 0; fly < 10; fly++) { cout << "This is a kite flying" << fly << endl: }

These are two different variables, because the for block creates a new scope. — Barmar
– Barmar, Commented May 11, 2015 at 22:11
Try printing fly after the loop and you'll see that it's still 0. — Barmar
– Barmar, Commented May 11, 2015 at 22:12

laurisvr · Accepted Answer · 2015-05-12 05:26:09Z

These are two seperate variable because they are declared in a different scope. The scope of a variable is the "area" of code in which it's visible.

As a simple rule of thumb, any place where curly brackets are, or could be placed, is a new scope. The fly inside the for loop, overrides the other fly variable. If it wasn't declared, or declared under a different name. The original variable would still be accessible.

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