Scope modifiers: Difference between revisions
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Walterpachl (talk | contribs) (→{{header|REXX}}: add Version 2 with comments on dynamic scope) |
Walterpachl (talk | contribs) m (→version 2 scope is DYNAMIC: add assignment in s) |
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c=3 |
c=3 |
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Call p /* a Procedure */ |
Call p /* a Procedure */ |
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Say 'in m a b c x' a b c x |
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Call s /* a subroutine */ |
Call s /* a subroutine */ |
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Say 'in m a b c x' a b c x |
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Exit |
Exit |
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p: Procedure Expose sigl b |
p: Procedure Expose sigl b |
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s: |
s: |
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Say 'in s sigl a b c' sigl a b c |
Say 'in s sigl a b c' sigl a b c |
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x=4 |
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Return</lang> |
Return </lang> |
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{{out}} |
{{out}} |
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When s is called from p, it can only see the variable b that is exposed by p. |
When s is called from p, it can only see the variable b that is exposed by p. |
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When called directly, it sees all the 'global variables a, b, and c. |
When called directly, it sees all the 'global' variables a, b, and c. |
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<br>Assigning a variable in the subroutine s |
<br>Assigning a variable x in the subroutine s will similarly be seen or not in the main program. |
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<pre>in p sigl a b c 4 A 2 C |
<pre>in p sigl a b c 4 A 2 C |
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in s sigl a b c |
in s sigl a b c 12 A 2 C |
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in |
in m a b c x 1 2 3 X |
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in s sigl a b c 6 1 2 3 |
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in m a b c x 1 2 3 4 </pre> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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