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Where do use LOW-VALUE and HIGH-VALUE in COBOL. Also explain which kind of values they represent?

  
Total Answers and Comments: 2 Last Update: July 25, 2008     Asked by: sekhargupta 
  
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August 02, 2007 10:02:53   #1  
sunayana.sarangi Member Since: August 2007   Contribution: 7    

RE: Where do use LOW-VALUE and HIGH-VALUE in COBOL. Al...

One of the use cases of HIGH-VALUE and LOW-VALUE are in the Binary Search using SEARCH ALL. If the table to be searched is only partially populated the SEARCH ALL may not work correctly. If the table is ordered in ascending sequence then to get the SEARCH ALL to function correctly the unpopulated elements must be filled with HIGH-VALUES. If the table is in descending sequence the unpopulated elements should be filled with LOW-VALUES.


 
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January 08, 2008 11:48:14   #2  
lfrank Member Since: January 2008   Contribution: 9    

RE: Where do use LOW-VALUE and HIGH-VALUE in COBOL. Also explain which kind of values they represent?
LOW-VALUE represents X'00' and HIGH-VALUE represents X'FF'. These equate to the lower and upper limits of the collating sequence. All other values fall in between.

There are many uses. Say you wanted to know who had the highest and lowest sales for the month. Many people have specific "first time code" to read the first record and move the sales amount to the HIGH-SALE and LOW-SALE fields.

Define the fields as 05 HIGH-SALE PIC 9(5) VALUE LOW-VALUES.
and 05 LOW-SALE PIC 9(5) VALUE HIGH-VALUES.

Then simply compare the input sales amount to HIGH-SALE and LOW-SALE and move it to HIGH-SALE when it is higher than the current value and to LOW-SALE when it is lower than the current value.

 
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