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Pass by value means that a copy of the actual parameter's value is made in memory, i.e. the caller and callee have two independent variables with the same value Function prototypes tell the compiler everything it needs to know about how to call each function when it appears in code. C++ requires prototype declarations Two methods of passing arguments as parameters. ▫ Call-by-value. ▫ 'copy' of value is passed. ▫ Call-by-reference. ▫ 'address of' actual argument is C++ reference variables essentially pass arguments via pointer/address behind the scences but use the syntax of pass-by-value (i.e. no more de-referencing).In general, pass by reference is also known as pass by the address of the values declared in the arguments in the calling function relative to the formal The C++ implementation of pass-by-reference is without parallel in Java, value that can be assigned to a pointer variable, but references are not values. And Call by Reference means that we deal with passing values of variables as the parameters to the function, if we pass address of those.