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IF statements in COBOL

IF statements in COBOL. Please open the speaker notes - they contain additional information!. Simple IF - processing on Y only. IF AMT > 5000. N. Y. AMT x 10 = ANS-WS. If the data in the AMT field is greater than 5000, we want to multiply the data by 10 and put the answer in ANS-WS.

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IF statements in COBOL

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  1. IF statements in COBOL Please open the speaker notes - they contain additional information!

  2. Simple IF - processing on Y only IF AMT > 5000 N Y AMT x 10 = ANS-WS If the data in the AMT field is greater than 5000, we want to multiply the data by 10 and put the answer in ANS-WS. IF AMT > 5000 MULTIPLY AMT BY 10 GIVING ANS-WS. You can end the IF statement with a period or you can end it with an END-IF. IF AMT > 5000 MULTIPLY AMT BY 10 GIVING ANS-WS END-IF.

  3. Comparison operators • Valid relational operators are: • (Note: IS optional) • IS [NOT] EQUAL TOIS [NOT] =IS [NOT] GREATER THANIS [NOT] IS [NOT] LESS THANIS [NOT] <IS GREATER THAN OR EQUAL TOIS =IS LESS THAN OR EQUAL TOIS <=

  4. Simple IF - processing on Y or N IF AMT > 5000 N Y AMT x 5 = ANS-WS AMT x 10 = ANS-WS IF AMT > 5000 MULTIPLY AMT BY 10 GIVING ANS-WS ELSE MULTIPLY AMT BY 5 GIVING ANS-WS. In this example, if the AMT is greater than 5000 then we want to multiply AMT by 10 and store the answer in ANS-WS. If the AMT is not greater than 5000 then we want to multiply AMT by 5 and store the answer in ANS-WS. IF AMT > 5000 MULTIPLY AMT BY 10 GIVING ANS-WS ELSE MULTIPLY AMT BY 5 GIVING ANS-WS END-IF Note: An IF statement can be terminated by a period or the END-IF command.

  5. Simple IF - multiple processing steps IF AMT > 5000 N Y AMT x 5 = ANS-WS AMT x 10 = ANS-WS MOVE “LESS” TO MSG-PR MOVE “GREATER” TO MSG-PR IF AMT > 5000 MULTIPLY AMT BY 10 GIVING ANS-WS MOVE “GREATER” TO MSG-PR ELSE MULTIPLY AMT BY 5 GIVING ANS-WS MOVE “LESS” TO MSG-PR END-IF IF AMT > 5000 MULTIPLY AMT BY 10 GIVING ANS-WS MOVE “GREATER” TO MSG-PR ELSE MULTIPLY AMT BY 5 GIVING ANS-WS MOVE “LESS” TO MSG-PR.

  6. Simple IF - PERFORM processing IF AMT > 5000 N Y PERFORM B-310-LS-ROUT PERFORM B-300-GR-ROUT. IF AMT > 5000 PERFORM B-300-GR-ROUT ELSE PERFORM B-310-LS-ROUT END-IF IF AMT > 5000 PERFORM B-300-GR-ROUT ELSE PERFORM B-310-LS-ROUT.

  7. IF with NEXT SENTENCE IF ANS-WS > 100 N Y MOVE ANS-WS TO ANS-PR IF ANS-WS > 100 NEXT SENTENCE ELSE MOVE ANS-WS TO ANS-PR. IF ANS-WS > 100 NEXT SENTENCE ELSE MOVE ANS-WS TO ANS-PR END-IF

  8. IF with NOT IF ANS-WS NOT > 100 N Y MOVE ANS-WS TO ANS-PR IF ANS-WS NOT > 100 MOVE ANS-WS TO ANS-PR. IF ANS-WS NOT > 100 MOVE ANS-WS TO ANS-PR END-IF

  9. AND relationship IF INVCD = “A” N Y IF AMT > 5000 Y N MOVE “OKAY” TO MSG-PR IF INVCD = “A” IF AMT > 5000 MOVE “OKAY” TO MSG-PR. IF INVCD = “A” IF AMT > 5000 MOVE “OKAY” TO MSG-PR END-IF END-IF The IF statement can be terminated with a period or an END-IF for each IF used.

  10. Combined/compound AND IF INVCD = “A” N Y IF AMT > 5000 Y N MOVE “OKAY” TO MSG-PR IF INVCD = “A” AND AMT > 5000 MOVE “OKAY” TO MSG-PR END-IF IF INVCD = “A” AND AMT > 5000 MOVE “OKAY” TO MSG-PR.

  11. AND relationship - includes processing if not true IF INVCD = “A” N Y IF AMT > 5000 Y N MOVE “ERROR” TO MSG-PR MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR IF INVCD = “A” IF AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF ELSE MOVE “ERROR” TO MSG-PR END-IF IF INVCD = “A” IF AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR.

  12. Combined/compound AND IF INVCD = “A” N Y IF AMT > 5000 Y N MOVE “ERROR” TO MSG-PR MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR IF INVCD = “A” AND AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR. IF INVCD = “A” AND AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF

  13. INVALID AND code IF INVCD = “A” N Y IF AMT > 5000 Y N MOVE “NOT A” TO MSG-PR MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR IF INVCD = “A” AND AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR. IF INVCD = “A” AND AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF The problem is the MOVE after the ELSE does not know which question received an answer of NO and therefore can’t mvoe the appropriate message.

  14. IF with different processing for NO response IF INVCD = “A” N Y IF AMT > 5000 Y N MOVE “NOT A” TO MSG-PR MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR IF INVCD = “A” IF AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR ELSE MOVE “NOT A” TO MSG-PR. IF INVCD = “A” IF AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF ELSE MOVE “NOT A” TO MSG-PR END-IF

  15. OR relationship IF INVCD = “A” N Y MOVE “OKAY” TO MSG-PR IF AMT > 5000 Y N MOVE “OKAY” TO MSG-PR IF INVCD = “A” MOVE “OKAY” TO MSG-PR ELSE IF AMT > 5000 MOVE “OKAY” TO MSG-PR. IF INVCD = “A” MOVE “OKAY” TO MSG-PR ELSE IF AMT > 5000 MOVE “OKAY” TO MSG-PR END-IF END-IF

  16. Combined/compound OR IF INVCD = “A” N Y MOVE “OKAY” TO MSG-PR IF AMT > 5000 Y N MOVE “OKAY” TO MSG-PR IF INVCD = “A” OR AMT > 5000 MOVE “OKAY” TO MSG-PR. IF INVCD = “A” OR AMT > 5000 MOVE “OKAY” TO MSG-PR END-IF

  17. OR with Yes and No processing IF INVCD = “A” N Y MOVE “OKAY” TO MSG-PR IF AMT > 5000 Y N MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR IF INV-CD = “A” MOVE “OKAY” TO MSG-PR ELSE IF AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF END-IF IF INV-CD = “A” MOVE “OKAY” TO MSG-PR ELSE IF AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR.

  18. IF INVCD = “A” OR compound with Y/N processing N Y MOVE “OKAY” TO MSG-PR IF AMT > 5000 Y N MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR IF INV-CD = “A” OR AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR. IF INV-CD = “A” OR AMT > 5000 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF

  19. IF INVCD = “A” OR with different processing N Y MOVE “OK - A” TO MSG-PR IF AMT > 5000 Y N MOVE “ERROR” TO MSG-PR MOVE “OK - AMT” TO MSG-PR IF INV-CD = “A” MOVE “OK-A” TO MSG-PR ELSE IF AMT > 5000 MOVE “OK-AMT” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF END-IF IF INV-CD = “A” MOVE “OK-A” TO MSG-PR ELSE IF AMT > 5000 MOVE “OK - AMT” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR.

  20. IF INVCD = “A” INVALID OR with different processing N Y MOVE “OK - A” TO MSG-PR IF AMT > 5000 Y N MOVE “ERROR” TO MSG-PR MOVE “OK - AMT” TO MSG-PR IF INV-CD = “A” or AMT > 5000 MOVE “OK-A” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF IF INV-CD = “A” OR AMT > 5000 MOVE “OK-A” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR.

  21. cond1 AND (cond 2 or cond3) IF INVCD = “A” N Y IF AMT-FST > 500 Y N MOVE “OKAY” TO MSG-PR IF AMT-SND > 200 N Y MOVE “OKAY” TO MSG-PR

  22. Rules for combined/compound • When you combine AND, OR and NOT, the following rules must be followed: • Evaluation works from left to right • Parenthesis are resolved first - inner parenthesis are resolved before outer parenthesis • NOT evaluated next • AND and the conditions around it evaluated next • OR and the conditions around it are evaluated last

  23. Cond1 AND (cond2 OR cond3) - COBOL code Code using PERIOD: IF INVCD = “A” IF AMT-FST > 500 MOVE “OKAY” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OKAY” TO MSG-PR. A single period ends all of the IF statements. END-IF needs an END-IF for each IF statement. There are times when both styles are appropriate. Today’s coding style emphasized the END-IF Code using END-IF: IF INVCD = “A” IF AMT-FST > 500 MOVE “OKAY” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OKAY” TO MSG-PR END-IF END-IF END-IF When dealing with compound AND and OR it must be noted that AND gets resolved before OR. If you want to resolve the OR first, you must enclose it in parenthesis. Compound AND/OR (2 versions): IF INVCD = “A” AND (AMT-FST > 500 OR AMT-SND > 200) MOVE “OKAY” TO MSG-PR. IF INVCD = “A” AND (AMT-FST > 500 OR AMT-SND > 200) MOVE “OKAY” TO MSG-PR END-IF

  24. Compound AND/OR with different processing for Y/N IF INVCD = “A” N Y IF AMT-FST > 500 MOVE “ERROR” TO MSG-PR Y N MOVE “OKAY” TO MSG-PR IF AMT-SND > 200 N Y MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR

  25. CODE for AND/OR SIMPLE AND/OR IF IF INVCD = “A” IF AMT-FST > 500 MOVE “OKAY” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF END-IF ELSE MOVE “ERROR” TO MSG-PR END-IF SIMPLE AND/OR IF IF INVCD = “A” IF AMT-FST > 500 MOVE “OKAY” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR. COMPOUND AND/OR IF (2 versions) IF INVCD = “A” AND (AMT-FST > 500 OR AMT-SND > 200) MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR. IF INVCD = “A” AND (AMT-FST > 500 OR AMT-SND > 200) MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF

  26. AND/OR - different NO processing IF INVCD = “A” N Y IF AMT-FST > 500 MOVE “NOT A” TO MSG-PR Y N MOVE “OKAY” TO MSG-PR IF AMT-SND > 200 N Y MOVE “ERROR” TO MSG-PR MOVE “OKAY” TO MSG-PR

  27. SIMPLE AND/OR IF IF INVCD = “A” IF AMT-FST > 500 MOVE “OKAY” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF END-IF ELSE MOVE “ERROR” TO MSG-PR END-IF AND/OR - different NO processing SIMPLE AND/OR IF IF INVCD = “A” IF AMT-FST > 500 MOVE “OKAY” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR ELSE MOVE “NOT A” TO MSG-PR. COMPOUND AND/OR IF (2 versions) IF INVCD = “A” IF AMT-FST > 500 OR AMT-SND > 200 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR ELSE MOVE “NOT A” TO MSG-PR. IF INVCD = “A” IF AMT-FST > 500 OR AMT-SND > 200 MOVE “OKAY” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF ELSE MOVE “NOT A” TO MSG-PR END-IF

  28. AND/OR - different YES and NO processing IF INVCD = “A” N Y IF AMT-FST > 500 MOVE “NOT A” TO MSG-PR Y N MOVE “OK - FST” TO MSG-PR IF AMT-SND > 200 N Y MOVE “ERROR” TO MSG-PR MOVE “OK- SND” TO MSG-PR

  29. AND/OR - different processing for everything SIMPLE AND/OR IF IF INVCD = “A” IF AMT-FST > 500 MOVE “OK - FST” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OK - SND” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR ELSE MOVE “NOT A” TO MSG-PR. SIMPLE AND/OR IF IF INVCD = “A” IF AMT-FST > 500 MOVE “OK - FST” TO MSG-PR ELSE IF AMT-SND > 200 MOVE “OK - SND” TO MSG-PR ELSE MOVE “ERROR” TO MSG-PR END-IF END-IF ELSE MOVE “ERROR” TO MSG-PR END-IF

  30. CONTINUE IF INVCD = “A” N Y IF AMT > 5000 IF INVCD = “A” IF AMT > 5000 PERFORM B-300-CALC ELSE CONTINUE END-IF MOVE “OKAY” TO MSG-PR END-IF Y N CONTINUE PERFORM B-300-CALC With this code, when CONTINUE is encountered, control goes to the MOVE “OKAY” command. IF NEXT SENTENCE was used control would drop entirely out of the IF. MOVE “OKAY” TO MSG-PR

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