HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 653

« → x « x SINH 1 x SQ ADD / » ». When done editing the program press ` . The modified program is stored back into variable @@g@@. Global Variable Scope Any variable that you define in the HOME directory or any other directory or sub-directory will be considered a global variable from the point of view of program development. However, the scope of such variable, i.e., the location in the directory tree where the variable is accessible, will depend on the location of the variable within the tree (see Chapter 2). The rule to determine a variable's scope is the following: a global variable is accessible to the directory where it is defined and to any sub-directory attached to that directory, unless a variable with the same name exists in the sub-directory under consideration. Consequences of this rule are the following: • A global variable defined in the HOME directory will be accessible from any directory within HOME, unless redefined within a directory or subdirectory. • If you re-define the variable within a directory or sub-directory this definition takes precedence over any other definition in directories above the current one. • When running a program that references a given global variable, the program will use the value of the global variable in the directory from which the program is invoked. If no variable with that name exist in the invoking directory, the program will search the directories above the current one, up to the HOME directory, and use the value corresponding to the variable name under consideration in the closest directory above the current one. A program defined in a given directory can be accessed from that directory or any of its sub-directories. Page 21-4