Hi there

I wonder if anyone can help out a newbie. I am trying to understand the difference between passing variables by reference or value. This is what I understand so far:

1. Passing parameters by value is when the variable is copied into the parameter list of a function or procedure. The value is independent and remains unchanged when passed.

2. Passing parameters by reference is when a value being passed is linked to the original value. THis means that the original value can be altered.

I am not sure on what occasion you would use what and for what reasons...I would be really grateful if someone could explain this to me...

Thanks in advance!

Potsuki

hi potsuki
well........almost all exams of c or programming
language had asked this question...........
well to begin with call by value.
it is used when u don't want to
change the contents of a variable permanently
well to understand this u 1st have 2 understand the
concept of pointers or memory locations..........
in call by value u ar passing the copy of variable
changing it in the called fuction doesn't effect the memory loaction of
the variable.........but in case of the call by refrence u r passing the
address of the variable......so any change wud b a permanent change
as u practice more u wud urself understand when 2 use which 1.

frank

Hi Frank

Thank you for your repsonse. This has helped me to understand this more.

Thank you

Potsuki