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C++ supports object-oriented programming, but OO is not intrinsic to the language. In fact, the main function isn't a member of an object. In smalltalk or Java, you can't tie your shoes (or write Hello, world) without at least one class.
between a function call and the same functionâs declaration, your program will compile. In C++, a function prototype is required for each of your programâs func-tions. Your C++ program will not compile unless each and every function prototype is in place. As in C, you can declare a function without a return type. If no return type is present, the function is assumed to have a return type of int. 1