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Operating_systems-page43 - Jelena Mamenko Operating Systems...

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Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 43 An IF ERRORLEVEL test is true if the error level tested is less than or equal to the actual error level. Therefore, such tests have to be in reverse order or the first will always be true. @ECHO OFF :START CLS ECHO -------------------- ECHO 1 – Wordprocessing ECHO 2 – Spreadsheet ECHO 3 - Exit menu to DOS ECHO -------------------- :QUERY ECHO 1, 2, or 3? GETKEY IF ERRORLEVEL 52 GOTO QUERY IF ERRORLEVEL 51 GOTO L3 IF ERRORLEVEL 50 GOTO L2 IF ERRORLEVEL 49 GOTO L1 GOTO QUERY :L1 Commands necessary to call up word processor GOTO START :L2 Commands necessary to call up spreadsheet GOTO START :L3 CLS GETKEY.COM GETKEY.COM is a small file that you need to create to allow the example above to work. If you are not comfortable with the procedure outlined below
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