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The GNU C Library

20.8 Arithmetic Functions

The C library provides functions to do basic operations on floating-point numbers. These include absolute value, maximum and minimum, normalization, bit twiddling, rounding, and a few others.

20.8.1 Absolute Value		Absolute values of integers and floats.
20.8.2 Normalization Functions		Extracting exponents and putting them back.
20.8.3 Rounding Functions		Rounding floats to integers.
20.8.4 Remainder Functions		Remainders on division, precisely defined.
20.8.5 Setting and modifying single bits of FP values		Sign bit adjustment. Adding epsilon.
20.8.6 Floating-Point Comparison Functions		Comparisons without risk of exceptions.
20.8.7 Miscellaneous FP arithmetic functions		Max, min, positive difference, multiply-add.