Why is the return type not automatically determined?

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The return type is not automatically determined because the developer needs to explicitly specify the data type that the function will return. This is important because it helps to ensure that the function returns data that is of the correct type and can be used by other parts of the program without causing errors or unexpected behavior. Additionally, specifying the return type can help make the code more readable and understandable, as other developers can see at a glance what type of data the function will return.