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Difference between call by value and call by reference

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What's the difference between called by value and called by reference? What's the default for C++? Is there a small example you could show to visually see the difference between the two?

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This solution explains with the help of relevant examples, the difference between call by value and call by reference

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 What's the difference between called by value and called by reference? What's the default for C++? Is there a small example you could show to visually see the difference between the two?
Solution:
There are two ways in which a function can be called:
a) Pass by Value
b) Pass by Reference

The difference between pass by value and pass by reference ...

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