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Subject:
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ByRef and ByVal
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Posted By:
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kgs51
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Post Date:
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11/2/2004 4:16:33 PM
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Can someone explain the difference between ByRef and ByVal using an example. This would be most appreciated.
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Reply By:
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marcostraf
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Reply Date:
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11/2/2004 6:42:56 PM
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public sub XByRef(byref a as long)
''a is a reference to the original caller variable
a = a + 10
exit sub
public sub XByVal(byval a as long)
''a is a just a copy of the original caller variable
a = a + 10
exit sub
using byref, the variable 'a' is increased by 10 in the caller scope. Using byval, it remains the same.
dim a as long
a = 10
call XByVal(a)
'' a is still 10
call XByRef(a)
'' a is now 10
Use ByRef if you want that the method can change the value of the variable when it returns.
Marco
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Reply By:
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kgs51
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Reply Date:
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11/2/2004 7:09:09 PM
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Marco,
Thankyou very much for the example
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