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تابع isnan چک می کند که آیا عدد ورودی nan (نامعین) است یا نه؟ درصورتی که ورودی نامعین باشد، خروجی یک (درست) و در غیر این صورت، خروجی صفر (غلط) است. توجه کنید که مقادیر نامعین را نمی توان با مقایسه یافت.