C++ is object-oriented. It is not object-based because, like C before it, C++ supports the principal of primitive data types, which are not object-based.

To find the mass of an object based on the displaced water, you can make use of Archimedes' principle. Measure the volume of the water displaced by the object, and then multiply it by the density of water (usually 1 g/mL). This will give you the mass of the object.

In simple words i can say object oriented=object based + inheritance i mean object based languages no need follow the oop concepts (inheritance) in this you can create your own calsses. but you can't access based class please let me know if anything wrong in this Ashok Sharing ideas will improve knowledge........

C is a procedural programming language.

Object-based programming language is a language that supports all the features of object oriented programming features like classes,object,encapsulation ,abstraction,polymorphism etc except inheritence.