One of the differences between structure and classes socially is that structure is the organization of society, and classes are the stratification within that society. Think of it like a closet, and the different styles of clothes within the closet.
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There is still Caste System (social classes) in India and it puts differences between the people.
The main difference between a class and a structure is that structures are always public whereas classes are private by default. Classes give greater control as the interface can be engineered such that only code that requires access to specific class members gains that access. Everything else can be hidden within the class itself. Note that C does not support classes, period. Classes are only supported by C++. However C++ also supports C structures for backward compatibility with C-style code.
Classes are expanded concepts of structures, and can hold functions along with variables and other information.
A natural structure is formed entirely by nature, whilst a building, bridge, etc. is a manufactured structure.
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difference between layered and kernel base approach in OS structure
There is still Caste System (social classes) in India and it puts differences between the people.
I do not believe that this belongs in the "computer programming" category.
Differences between multinational and domestic companies are found in the legal and economic structure. Also, exchange rate risks are different.
The main physical difference would be size.
There are many similarities and differences between a shark and a whale. The similarities is that have a similar streamlined body structure but the differences are many including sharks are fish while whales are mammals, sharks have a vertical tail structure while whales have a horizontal one among others.