ilogb(3M) ilogb(3M)[top]NAMEilogb(), ilogbf(), ilogbl(), ilogbw(), ilogbq() - radix-independent exponent functionsSYNOPSISIntegrity Server OnlyDESCRIPTIONThe function computes the exponent of the floating point value x. For‐ mally, the return value is the integral part of log base r of |x| as a signed integral value, for nonzero x, where r is the radix of the machine's floating-point arithmetic. The radix r is 2 on HP-UX sys‐ tems. If x is denormal it is treated as though it were normalized before the exponent is determined. Note: is equivalent to for all values of x Integrity Servers Only is a version of it takes a argument. is a version of it takes a argument. is an version of it takes an argument. is equivalent to on HP-UX systems.USAGETo use these functions, compile either with the default option or with the and options. To use (for Integrity servers) or compile also with the option. Make sure your program includes Link in the math library by specifying on the compiler or linker command line. For more information, see the at the following site:RETURN VALUEIf x is NaN, returns If x returns If x is zero, returns Integrity Servers Only If x is NaN, +-INFINITY, or zero, then the invalid floating-point exception is raised (as specified by C99 TC2) The macros and are defined inERRORSNo errors are defined.SEE ALSOfrexp(3M), logb(3M), scalb(3M), scalbn(3M), scalbln(3M), math(5).STANDARDS CONFORMANCE: XPG4.2, ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic") : ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arith‐ metic") ilogb(3M)

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