java - Why does the Math.round(float f) method in Android check for NaN? -


इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 8 जवाब

मैं < कोड> गणित एंड्रॉइड फ़्रेमवर्क में स्रोत और यह है कि राउंड () विधि कैसा दिखता है: 

  सार्वजनिक स्थिर इंराउंड (फ्लोट एफ) { // NaN के लिए चेक करें यदि (च! = एफ) {वापसी 0; } वापसी (इंट) मंजिल (एफ + 0.5 एफ); }

मैं सफलता के बिना पहले जांच के मुताबिक अपने सिर को लपेटने की कोशिश कर रहा हूं। कैसे च खुद से अलग हो सकता है? मैं किसी भी टेस्ट केस के बारे में सोच भी नहीं सकता जो यह किसी भी अलग-अलग बना देगा ... कोई भी विचार?

कैसे खुद से अलग हो सकता है?

यदि f एक नाएन है तो यह अन्य नाएन सहित सभी फ्लोटों से भिन्न के रूप में परीक्षण करेगा। यह परिभाषा है से:

"यदि कोई ऑपरेंड नाएन है, तो == का नतीजा झूठा है, लेकिन इसका परिणाम है! = सच है। वास्तव में, परीक्षण x! = X सच है अगर और केवल अगर मूल्य X है नाएन। "

मैं भी किसी भी परीक्षण मामले के बारे में नहीं सोच सकता जो यह किसी भी अलग होगा ... कोई विचार?

एर, फ़्लोट। एनएएन।


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