--- title: "COBOL PERFORM Varying with UNITIL Logic" description: "COBOL Perform Varying Until logic useful to search a Table or an Array." url: https://srinimf.com/2016/01/23/cobol-loop-with-perform-varying-logic/ date: 2016-01-23 modified: 2026-10-09 author: "Srini" image: https://i0.wp.com/srinimf.com/wp-content/uploads/2016/01/cobol-perform-varying-until.jpg?fit=1200%2C700&ssl=1 categories: ["COBOL"] tags: ["Best Example for COBOL PERFORM VARYING", "Cobol Perform Varying"] type: post lang: en --- # COBOL PERFORM Varying with UNITIL Logic Here’s logic how to use PERFORM UNTIL. We use PERFORM statement for handling loops in COBOL. Here, this example shows PERFORM with UNTIL. ## [PERFORM Varying](https://srinimf.com/2011/11/30/cobolnestedperform/) Until Syntax ``` PERFORM paragraph-name VARYING a-variable-value FROM start-value BY increment-value UNTIL some-condition-is-met ``` ## PERFORM Varying UNTIL Example ``` PERFORM PARA-A VARYING TEST-1 FROM 1 BY 1 UNTIL TEST-1 > 1000 OR FILE-SWITCH = 'EOF' ``` ## **Bonus Post** [![COBOL: How to use PERFORM-TEST-AFTER Logic](https://i0.wp.com/srinimf.com/wp-content/uploads/2016/08/cobol-test-after.jpg?resize=800%2C600&ssl=1)](https://srinimf.com/2016/08/24/how-to-use-perform-test-after-logic-in-cobol/) ### [COBOL: How to use PERFORM-TEST-AFTER Logic](https://srinimf.com/2016/08/24/how-to-use-perform-test-after-logic-in-cobol/) You can use this COBOL logic written using PERFORM TEST AFTER. This is one best way of handling loops in COBOL programs. After reading input files you need to validate each record. So this logic helps you as a guide. 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