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i was just curious to know if all the codes provided by Apple is the ios dev library, and by the forums are objective c or c++. What exactly is the difference between the two?
Which one works in Xcode?
Both Obj-C and C++ are extensions of the C language. Both wanted to do the same – extend C with objects.
C++ is much more complex and currently much more popular on every non-Apple system.
Both work in Xcode. Actually you can combine Obj-C and C++ in one program (Obj-C++).
The differences between the languages are great – objects are declared, allocated and freed differently. Not only the syntax is different, they were designed differently (Operator overriding, access rights, multiple inheritance, templates in C++; Message sending, categories, properties, reference counting, protocols in Obj-C).
It’s hard to explain the differences, if you don’t know anything about either of them.
Obj-C is easier to learn (it’s much simpler).
For both languages, you need to know C well.
EDIT: most of the code in iOS dev library is either pure C or Obj-C