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-.. _arduino-scope:
-
-Variable Scope
-==============
-
-Variables in the C programming language, which Arduino uses, have a
-property called *scope*. This is in contrast to languages such as
-BASIC where every variable is a *global* variable.
-
-
-
-A global variable is one that can be *seen* by every function in a
-program. Local variables are only visible to the function in which
-they are declared. In the Arduino environment, any variable
-declared outside of a function (e.g. setup(), loop(), etc. ), is a
-global variable.
-
-
-
-When programs start to get larger and more complex, local variables
-are a useful way to insure that only one function has access to its
-own variables. This prevents programming errors when one function
-inadvertently modifies variables used by another function.
-
-
-
-It is also sometimes handy to declare and initialize a variable
-inside a *for* loop. This creates a variable that can only be
-accessed from inside the for-loop brackets.
-
-
-
-Example:
---------
-
-::
-
-    int gPWMval;  // any function will see this variable
-    
-    void setup()
-    {
-      // ...
-    }
-    
-    void loop()
-    {
-      int i;    // "i" is only "visible" inside of "loop"
-      float f;  // "f" is only "visible" inside of "loop"
-      // ...
-    
-      for (int j = 0; j <100; j++){
-      // variable j can only be accessed inside the for-loop brackets
-      }
-    
-    }
-