Local to Global Variabel in C++ ?

Question

How to declare a local variable in the scope but we can access it from outside the scope, in the sense that we set the local state of the variable to be a global variable

Answer 1

Use dynamic memory allocation

Answer 2

It's not possible, because variables are destroyed outside the scope.
The only way is to create a global variable:

int a = 1;

void f()
{
a = 100;
}

Answer 3

Luk Mm okay, i think there is a rule or sign that make it happen

Answer 4

You can use static variables as Mirielle[ Exams ] demonstrated.

But l want to warn you that using global variables is considered bad practise. Everything can get confusing really fast, especially when using it as Mirielle[ Exams ] showed. I don't know if that comes into the category of badly written code, but I would try to avoid it as much as possible. See this:
https://www.learncpp.com/cpp-tutorial/why-global-variables-are-evil/

Answer 5

Mirielle[ Exams ]
XXX
Useful info, but i'll study that thx