What is the difference in passing values ByRef or ByVal to a function? Can you pls explain with detailed examples?

Replies to This Discussion

Permalink Reply by k.vijay on October 10, 2011 at 5:36pm

Hi Suma,

 

The paramerters passed to a function can be either call by value or call by ref, the default is call by ref

By Ref: If the value is changed in the function the parameter value is also changed.

By Val: If the value is changed in the function the parameter value is not changed

Eg:

dim a,b

a=10

b=20

function f1(byval x, byref y)

x=100

y=200

end function

call f1(a,b)

msgbox a&" "&b

 

output is 10, 200

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Permalink Reply by Suma K on October 12, 2011 at 10:33pm

Thanks vijay.

 

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Permalink Reply by k.vijay on October 13, 2011 at 7:55am

Hi suma,

 

welcome

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Permalink Reply by suresh on October 10, 2011 at 5:50pm

http://www.qualitytesting.info/forum/topics/can-any-body-explain-ca...

 

Please refer once Forum posts,Just before post.

 

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Permalink Reply by Subbu on October 10, 2011 at 5:50pm

Just FYI:

If you pass any DP objects you should use ByRef.

QTP use by default ByRef.

 

--Subbu.

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Permalink Reply by MohanKumar S on October 10, 2011 at 6:25pm

Hi,

Check the below link. Very good Example. 

http://www.sstutor.com/cpp/pointer2a.htm

Thanks,

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Permalink Reply by Shiv Saxena on October 17, 2011 at 9:35pm

Agreed with Mr.Srini Vuggumudi.

Thanks,

Shiv

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Permalink Reply by 05j4rvtur9dx3 on October 18, 2011 at 11:36pm

In byval function we the value to the arguments

where as in byref we the reference (variable which storing the value) to the argument

 

Eg public function sum(byval a, byvalb)

sum=a+b

End function

call sum(20,30)

eg  public funcation sum(byref a,byref b)

sum =a+b

End funcation

x=10,y=20

call sum(x,y)

 

Regards,

Ramesh kongara

 

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