Can we overload operators for built-in types like int or float?

No we cannot overload integer or float types because overloading means to change the working of existing operators or make them to work with objects int is single member not an object.

Yes: You can pass ints and floats into overloaded functions

No: You cannot overload/override the operators for built in types when the built-in types are on both sides of the expression.

You cannot redefine a built-in operator. Operator overloading is designed to allow you to extend the language, not to change it. At least one of the parameters of an overloaded operator must be a user defined type (class or enum type) or a reference to a user defined type.