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ISO/IEC 9899:1999 6.3.1.4: "Real floating and integer"
Bibliography
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FLP06FLP34-C. Understand Ensure that floating -point arithmetic in C is inexact 05. Floating Point (FLP) FLP37-C. Cast the return value of a function that returns a floating point typepoint conversions are within range of the new type FLP36-C. Beware of precision loss when converting integral types to floating point FLP36-C. Beware of precision loss when converting integral types to floating point