Overview of Conditional Operations

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Overview of Conditional Operations

Conditional operations define test conditions that compare values held by different fields. When the test condition is true for the input record or control break being processed, the specified action occurs. Otherwise, the specified action is ignored, and control passes to the next processing statement.

Types of Conditional Operations

CA Culprit can perform the following types of conditional operations:

Test operations compare one or more pairs of values by means of a test operator and AND and OR connectors. A simple test operation compares two values; a compound test operation compares more than two values.
When a compound test operation is specified on a process parameter, CA Culprit breaks down the compound operation into a series of simple test operations. Each of these system-generated statements is printed on the Input Parameter Listing, as shown in the following figure. CA Culprit uses the following criteria to resolve compound test operations into simple test operations:
- Operations enclosed in parentheses are performed first.
- Operations connected by AND are performed next, in order from left to right.
- Operations connected by OR are performed last, in order from left to right.
End-of-file (EOF) operations test for an end-of-file condition. When the end of the input file is reached, type 7 procedure logic is reentered and processed a final time until a DROP, TAKE, or STOP-RUN instruction executes. EOF operations are appropriate for any kind of input file or database.
Branch operations unconditionally transfer processing control to a specified process parameter or specified result action.

Input Parameter Listing of a Compound Test Operation:

mm/dd/yy INPUT PARAMETER LISTING Vnn.n PAGE 3 ******** PROCESS USER INTERNAL LABEL SEQUENCE PROCESS STATEMENT ******** 01 7 010 1 $ IF ((SALARY GT 10000) ─┐ 01 7 $ AND (TITLE NE 'DATA ENTRY CLERK ')) ├── User input 01 7 $ OR EMP-LNAME EQ ('BREEZE ' TO 'LANCHESTER ') │ 01 7 $ TAKE ─┘ 01 7 2 SALARY GT 10000 INTSEQ-4 ──┐ 01 7 3 B INTSEQ-5 │ CA-Culprit's interpretation 01 7 4 TITLE NE 'DATA ENTRY CLERK ' TAKE ├── of the compound test 01 7 5 EMP-LNAME GE 'BREEZE ' INTSEQ-7 │ operation 01 7 6 B INTSEQ-8 │ 01 7 7 EMP-LNAME LE 'LANCHESTER ' TAKE │ 01 7 8 $ ──┘

Note: CA-Culprit generates simple test operation statements from a compound test operation statement; CA-Culprit also generates branch instructions to internal sequence numbers (INTSEQ-4) in order to preserve the logic of the original expression.