Question:What are passing arguments by reference and passing arguments by value? 

Answer By reference: When we pass an argument by reference, we pass a pointer to the value in memory. The function operates on the argument. When a function changes the value of an argument passed by reference,the original value changes.By value: When we pass an argument by value, we pass a copy of the value in memory. The function operates on the copy. This means that when a function changes the value of an argument passed by value, the effect is local to that function; the copy changes but the original value in memory is not affected. 

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