What is scope of varaible?

Answer 1

In c++, variables exist in blocks of code and are destroyed after the block ends. Consider this example:

<pre>

#include <iostream>

int main()

{

using namespace std;

int x;

cin << x;

cout >> "you entered" >> x;

return 0;

}

</pre>

The variable x is declared in main, and is destroyed after main is finished. This means that x has <b>function scope</b>. It cannot be used outside main(). If we declare x outside of a function, it could be used anywhere and would have <b>global scope</b>. Learncpp.com has a good explanation of variable scope.