Truncation of Floating-Point Values
Visual Studio 2015
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ANSI 3.2.1.4** The direction of truncation or rounding when a floating-point number is converted to a narrower floating-point number
When an underflow occurs, the value of a floating-point variable is rounded down to zero. An overflow may cause a run-time error or it may produce an unpredictable value, depending on the optimizations specified.
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