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These two types of user-defined functions have a different way of dealing with data. In Call by value function, the main() code and the function maintain separate copies of the same variable in the memory, beacause of which any change in the variable value in the function will not change the value of the same variable in the main code unless it is returned back.
While, in the Call by reference function, both the main() code and the function refer to the memory address of the same variable. Hence any change in the value of the variable reflects the change for both, permanently.
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