Doubt regarding two strings used in program

#1

Why there aretwo strings one expr in main and another str in function checkExpression.If we will iterate over str string isn’t it different string?

#2

Hey
str is a parameter in the function checkExpression, the call to checkExpression has been given in the main function, the copy of string str is passed to checkExpression and it is the named as parameter expr, so string is same, just passed as a copy with a different name.

#3

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