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futuredba
New User
Joined: 08 Jan 2006 Posts: 22 Location: Delhi




Hi,
Look at this code:
WSVAR1 pic 9(2)V9(9) value 1.939491221.
WSVAR2 pic 9(2)V9(3) value 0.
Multiply 1 by WSVAR1 giving WSVAR2 ROUNDED.
After executing the above code, i was expecting 1.940 in WSVAR2 but strangely it had 1.939. It seems to me that since WSVAR2 has only 3 decimal places so it was rounding off the resultant value from 4th decimal places.
What should I do so that it does the rounding off from the last decimal place of the resultant value not just 1 decimal place more than the receiver field?
Thanks,
Sumit 

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dick scherrer
Site Director
Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix




Hello,
Quote: 
i was expecting 1.940 in WSVAR2 but strangely it had 1.939 
I believe you need to change your expectation. In your example, ROUND is working exactly as it should, not strangely.
Quote: 
When the size of the fractional result exceeds the number of places provided for its storage, truncation occurs unless ROUNDED is specified. When ROUNDED is specified, the least significant digit of the resultant identifier is increased by 1 whenever the most significant digit of the excess is greater than or equal to 5. 
The most significant digit of the excess is 4, the result is not "rounded up". 

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dick scherrer
Site Director
Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix




Hello again,
Code: 
WSVAR1 pic 9(2)V9(9) value 1.939491221.
WSVAR2 pic 9(2)V9(3) value 0.

You might try:
Code: 
COMPUTE WSVAR2 = WSVAR1 + .000999999 
I'm not able to test just now due to some system maintenance, but i believe that will give the result you want.
If not, post back here and i'll figure out where i went wrong 

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futuredba
New User
Joined: 08 Jan 2006 Posts: 22 Location: Delhi




Hi,
According to the defination of rounding off in math, that i was taught during my school days, 1.93949 should be first rounded up to 1.9395 and it should be again rounded up to 1.940. So i thought cobol keyword ROUNDED is not doing what rounding means in mathematics.
But I just searched some web sites over internet and found that rounding off in mathematics means exactly what ROUNDED doing in cobol.
I didn't want to make the number 1.940 intentionally. I just wanted to make sure that it is rounded off correctly as far as mathematics is corcerned.
Thanks for you reply,
Sumit 

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Robert Sample
Global Moderator
Joined: 06 Jun 2008 Posts: 8165 Location: East Dubuque, Illinois, USA




Sumit, I've never heard of rounding one digit at a time as you were taught in school  I've always heard rounding only applies to the digit after the last significant digit and 0 to 4 round down, 5 to 9 round up. I guess even after getting a bachelor's degree in mathematics, there's still stuff to learn! 

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dick scherrer
Site Director
Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix




Hello Sumit,
Quote: 
Thanks for you reply, 
You're welcome.
Thank you for the reply telling us that all is well now
d 

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