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The set of all values that a function will return as outputs is called the *range* of the function.
Classes cannot return values, only functions can return values. But you cannot return a function from a function, you can only return a function pointer -- a pointer variable holding the address of the function you wish to return. All possible return values must be of the same type, therefore all function signatures and return types must be exactly the same -- only the name of the functions can differ.
Not all functions return values. If you take a function which is of type void, you get a function which is does not return anything. The only functions which should return values are those which are used as a right side of expressions (so called rvalues).
It depends on the language. Python, for instance, can return any number of values. However, it's best to keep the number of return values as low as possible for the sake of simplicity and readability. Most languages only allow one return value at most, but languages that allow you to create new types (classes or structures) also allow you to return multiple values through objects of those types. That is, an object is just one value, but it may have one or more member objects or values embedded within. Failing that, if the language provides a "tuple" type then you can use that. If the return values are of the same type then you can also return multiple values via an array, or a pointer to an array, or a list, or any other sequence container provided by the language.
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The arithmetic mean is more commonly known as the average. It is the sum of the values divided by the number of values.
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To return multiple values of the same type, return an array. If the values are different types, return a tuple or data structure. To return values indirectly, return a pointer to the results (arrays implicitly convert to pointers, but tuples and data structures do not). A returned pointer must never refer to a local variable of the returning function; upon return, those variables will cease to exist, resulting in undefined behaviour. To avoid this, the caller may provide a user-defined storage location via an output argument, or the function may allocate the return values on the free store (the heap).
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Its function naming and parameter order/return values are inconsistent