TAL Programmer's Guide

CASE Statement, Labeled

Controlling Program Flow

096254 Tandem Computers Incorporated 12–7

Directives and CASE

Statements

If a CASE statement contains many GOTO statements, you can use the OPTIMIZE

directive to reduce the size of the object code. Use OPTIMIZE level 1 or 2 as follows:

In a program under development, use level 1.

In a stable program, use level 2, which optimizes code across statement

boundaries, so debugging is more difficult.

The CHECK directive does not affect the labeled CASE statement (as it does the

unlabeled CASE statement).

Labeled CASE

Statement Execution

Figure 12-3 shows how the labeled CASE statement executes.

Figure 12-3. Labeled CASE Statement Execution

CASE selector OF

BEGIN

END;

next-statement

406

OTHERWISE clause

case-alternative