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abhicet2003
New User
Joined: 16 Nov 2005
Posts: 21
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Hi all,
1. Please tell me the difference between
COMPUTE and MOVE?
2.Why EVALUATE need END-EVALUATE mandatory? I studied that EVALUATE doesn't need a break statement and whenever it find a match it will automatically come out of the condition. Then what is the purpose of END-EVALUATE?
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ralph_v
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Joined: 07 Jul 2005
Posts: 27
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With compute , one can use ON SIZE ERROR clause to check for truncations.
END-EVALUATE is the scope terminator. |
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mmwife
Super Moderator
Joined: 30 May 2003
Posts: 1592
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And don't forget ROUNDED.
MOVE (I think) allows mixed (num/alphanum) sending/recving flds in some circumstances; COMPUTE doesn't.
Otherwise MOVE/COMPUTE are equivalent. They generate identical code.
EVAL: I'd guess, since it's a new feature and scope terminators were introed at the same time, there's no need for backward compatiblity. |
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prasadvrk
Active User
Joined: 31 May 2006
Posts: 200
Location: Netherlands
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Using COMPUTE, you can do nemric operations like addition, subtraction, multiplication and division but using MOVE you can not do neither of these
END-EVALUATE is optional as far as I know. Same applies to any of the scope terminators. |
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lara
New User
Joined: 31 May 2006
Posts: 5
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| The scope-terminator (End-Evaluate) enhances the readability of the program. It's the same case with END-IF. |
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guptae
Moderator
Joined: 14 Oct 2005
Posts: 1208
Location: Bangalore,India
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Hi There,
Would u please tell me what is exact difference between move & compute statement?
MOVE A TO B
OR COMPUTE A=B |
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surya_pathaus
Active User
Joined: 28 Aug 2006
Posts: 110
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Hi Ekta,
Move A to B and compute a=b both acts like same.
difference is
MOVE statement carries out the assignment with truncation. Therefore, if the size error is needs to be detected, COMPUTE will be preferred over MOVE. The ON SIZE ERROR phrase of COMPUTE statement detects size-overflow. |
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guptae
Moderator
Joined: 14 Oct 2005
Posts: 1208
Location: Bangalore,India
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| Is there any other difference? |
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Marso
REXX Moderator
Joined: 13 Mar 2006
Posts: 1353
Location: Israel
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And this is how you introduce a new bug in your program: 
| Quote: |
| Move A to B and compute a=b both acts like same. |
In "MOVE A TO B", B is modified, A is unchanged
In "COMPUTE A=B", B is unchanged, it is A who is modified!! |
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surya_pathaus
Active User
Joined: 28 Aug 2006
Posts: 110
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Hi Marso,
| Quote: |
In "MOVE A TO B", B is modified, A is unchanged
In "COMPUTE A=B", B is unchanged, it is A who is modified!!
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I mean to say Two statements acts like move. |
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mmwife
Super Moderator
Joined: 30 May 2003
Posts: 1592
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Back to EVAL. If you use an EVAL stmt within an IF stmt (for example) you need the END-EVAL, if you don't, you can end it w/a period (.).
But you can't just let it hang there without either of those two. |
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