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somnath
New User
Joined: 21 Mar 2005
Posts: 18
Location: India
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I have a query regarding level 01 and 77.
Both can represent elementary data. So what is the advantage of using level 77?
Thanks in Advance,
Somnath |
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muthuvel
Active User
Joined: 29 Nov 2005
Posts: 217
Location: Canada
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| Code: |
| Both can represent elementary data. |
The above is true but 77 level can represent only elementary data.The element in 77 cannot be subdivided or cannot have a group of subelements .This is to indicate the variable declared in 77 is an elementary(some thing for special purpose) and should not be subdivided .
Level 01 can be elementary item or a part of a group item.
| Code: |
01 ws-a.
02 ws-b pic x(02).
02 ws-c pic x(03). |
the above code is possible.
| Code: |
77 ws-a.
02 ws-b pic x(02).
02 ws-c pic x(03). |
the above code is not possible.
hope this help |
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Devzee
Active Member
Joined: 20 Jan 2007
Posts: 684
Location: Hollywood
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muthuvel - Question is
| Quote: |
| what is the advantage of using level 77? |
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dr_te_z
New User
Joined: 08 Jun 2007
Posts: 71
Location: Zoetermeer, the Netherlands
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| somnath wrote: |
| what is the advantage of using level 77? |
the address. a 77 level field always starts at a "full word boundery". e.g.
| Code: |
01 foo.
03 filler pic X value space.
03 count-a pic s9(9) binary value zero.
77 count-b pic s9(9) binary value zero.
add 1 to count-a.
add 1 to count-b.
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count-a does not start at a full-word boundery, count-b does. In theory the 2nd ADD generates more efficient code (less instructions) than the 1st.
If it can be measured..... dunno never tried. |
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