// Variable Scope

// A and B are declared as global Variables
double A = 100;
double B = 200;

double
Scope(
   double     A,
   double     C)
{
// A and C are variables local to function "Scope"
// since they are parameters to the function

// if B below is declared (using double) it will 
// be local to "Scope".
// As is, it references the variable "B" declared 
// in global scope.

   B = 1000;

   return A * B / C;
}

// Call "Scope"
Scope(1,2);