ref: a37a13074c443c7104016187daad1e8171f0adc8
dir: /sys/man/2/frexp/
.TH FREXP 2 .SH NAME frexp, ldexp, modf \- split into mantissa and exponent .SH SYNOPSIS .B #include <u.h> .br .B #include <libc.h> .PP .B double frexp(double value, int *eptr) .PP .B double ldexp(double value, int exp) .PP .B double modf(double value, double *iptr) .SH DESCRIPTION .I Frexp returns the mantissa of .I value and stores the exponent indirectly through .IR eptr , so that .I value = .if t .IR frexp ( value )×2\u\s-2 (*eptr) \s0\d .if n .IR frexp ( value )*2** (*eptr). .PP .I Ldexp returns the quantity .if t .IR value ×2\u\s-2 exp \s0\d. .if n .IR value *2** exp. .PP .I Modf returns the signed fractional part of .I value and stores the integer part indirectly through .IR iptr . .SH SOURCE .B /sys/src/libc/port/frexp.c .SH SEE ALSO .IR intro (2) .SH DIAGNOSTICS .I Ldexp returns 0 for underflow and the appropriately signed infinity for overflow.