Why can’t we just mention it as node ? and also why are we passing sum as &sum, just even if we mention as sum it passes the same value of sum right? Can you please explain these concepts
What is the meaning of node* in the ModifyBST function parameters?
It’s a concept of pass by reference and parameter. In pass by parameter if we have a variable value 5, then when a call from x state goes to y and updates it’s value to 10, then at the time of backtracking when variable from y state goes to x, it’s value will be 10 only.
But in reference, while coming from y state to x, it values remain 5 only. Check this for better visualisation.
check this for better visualization:
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