THINK++ — Engineering Visualized

Block Scope

Local Variables

Variables declared inside a function or a block are local to that context. They are created when the block is entered and destroyed when it is exited.

EXAMPLE

void func() {
    int x = 10; // local to func
    cout << x;
}
// x cannot be used here!

STACK ALLOCATION

Typically stored on the stack, making allocation and deallocation very fast.

GARBAGE VALUES

Local variables aren't automatically initialized. They contain random "garbage" until assigned.

SHADOWING

A local variable "shadows" or hides a global variable with the same name within its scope.

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