Please express about those

Pointers and references Syntax of declaring pointers and references Address-of (&) operator Compare and contrast the two: o which can be reassigned? which MUST be initialized on declaration? o which allows a function to change a variable declared in another scope? o which allows a function to "return" multiple values? o which avoids duplicating the value of an argument when passed as a parameter? WHY DO WE HAVE THESE? General rules for choosing normal "value" parameters vs. references/pointer parameters