Version 5.0 The LEDA User Manual

ool ispInf(const bigfloat& x)
bool isnZero(const bigfloat& x)
bool ispZero(const bigfloat& x)
bool isZero(const bigfloat& x)
bool isInf(const bigfloat& x)
bool isSpecial(const bigfloat& x)
int sign(const bigfloat& x)
bigfloat abs(const bigfloat& x)
bigfloat ipow2(const integer& p)
integer ilog2(const bigfloat& x)
integer ceil(const bigfloat& x)
integer floor(const bigfloat& x)
returns true if and only if x is in special state pInf
returns true if and only if x is in special state nZero
returns true if and only if x is in special state pZero
returns true if and only if ispZero(x) or isnZero(x)
returns true if and only if ispInf (x) or isnInf (x)
returns true if and only if x is in a special state
returns the sign of x.
returns the absolute value of x
returns 2 p
returns the binary logarithm of abs(x), rounded up to the
next integer. Precondition: x ≠ 0
returns x, rounded up to the next integer
returns x, rounded down to the next integer
bigfloat sqrt d(const bigfloat& x, sz t p, int d = 2)
returns d√ x, with relative error ≤ 2 −p but not necessarily
exactly rounded to p binary digits
string
x.to string(sz t dec prec = global output prec)
returns the decimal representation of x, rounded to a decimal
precision of dec prec decimal places.
bigfloat& x.from string(string s, sz t bin prec = global input prec)
returns an approximation of the decimal number given by the
string s by a bigfloat that is accurate up to bin prec binary
digits