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The GNU C Library

20.5 Errors in Floating-Point Calculations

20.5.1 FP Exceptions		IEEE 754 math exceptions and how to detect them.
20.5.2 Infinity and NaN		Special values returned by calculations.
20.5.3 Examining the FPU status word		Checking for exceptions after the fact.
20.5.4 Error Reporting by Mathematical Functions		How the math functions report errors.