Select/When/Otherwise/End Instruction; Exercise - Using The If/Then/Else Instruction - IBM TSO/E REXX User Manual

Using Conditional Instructions

Exercise - Using the IF/THEN/ELSE Instruction

Write the REXX instructions for the following flowchart:
IF
False
B=2
False
A=3
ANSWER

SELECT/WHEN/OTHERWISE/END Instruction

To select one of any number of choices, use the
SELECT/WHEN/OTHERWISE/END instruction. In a flowchart it appears as follows:
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z/OS V1R1.0 TSO/E REXX User's Guide
False
True
IF
True
C=3
A=1
Possible Solution
IF A = 0 THEN
IF C = 2 THEN
B = 1
ELSE NOP
ELSE
IF B = 2 THEN
IF C = 3 THEN
A = 1
ELSE
A = 3
ELSE NOP
IF
True
A=0
IF
False
C=2
True
B=1