Float objects represent inexact real numbers using the native architecture's double-precision floating point representation.
Floating point has a different arithmetic and is an inexact number. So you should know its esoteric system. See following:
ConstantsThe minimum number of significant decimal digits in a double-precision floating point.
Usually defaults to 15.
The difference between 1 and the smallest double-precision floating point number greater than 1.
Usually defaults to 2.2204460492503131e-16.
An expression representing positive infinity.
The number of base digits for the double data type.
Usually defaults to 53.
The largest possible integer in a double-precision floating point number.
Usually defaults to 1.7976931348623157e+308.
The largest positive exponent in a double-precision floating point where 10 raised to this power minus 1.
Usually defaults to 308.
The largest possible exponent value in a double-precision floating point.
Usually defaults to 1024.
The smallest positive normalized number in a double-precision floating point.
Usually defaults to 2.2250738585072014e-308.
If the platform supports denormalized numbers, there are numbers between zero and Float::MIN. 0.0.next_float returns the smallest positive floating point number including denormalized numbers.
The smallest negative exponent in a double-precision floating point where 10 raised to this power minus 1.
Usually defaults to -307.
The smallest possible exponent value in a double-precision floating point.
Usually defaults to -1021.
An expression representing a value which is ânot a numberâ.
The base of the floating point, or number of unique digits used to represent the number.
Usually defaults to 2 on most systems, which would represent a base-10 decimal.
float % other → float click to toggle source
Returns the modulo after division of float by other.
6543.21.modulo(137) 6543.21.modulo(137.24)
static VALUE
flo_mod(VALUE x, VALUE y)
{
double fy;
if (RB_TYPE_P(y, T_FIXNUM)) {
fy = (double)FIX2LONG(y);
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
fy = rb_big2dbl(y);
}
else if (RB_TYPE_P(y, T_FLOAT)) {
fy = RFLOAT_VALUE(y);
}
else {
return rb_num_coerce_bin(x, y, '%');
}
return DBL2NUM(ruby_float_mod(RFLOAT_VALUE(x), fy));
}
float * other → float click to toggle source
Returns a new Float which is the product of float and other.
VALUE
rb_float_mul(VALUE x, VALUE y)
{
if (RB_TYPE_P(y, T_FIXNUM)) {
return DBL2NUM(RFLOAT_VALUE(x) * (double)FIX2LONG(y));
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
return DBL2NUM(RFLOAT_VALUE(x) * rb_big2dbl(y));
}
else if (RB_TYPE_P(y, T_FLOAT)) {
return DBL2NUM(RFLOAT_VALUE(x) * RFLOAT_VALUE(y));
}
else {
return rb_num_coerce_bin(x, y, '*');
}
}
float ** other → float click to toggle source
Raises float to the power of other.
2.0**3
VALUE
rb_float_pow(VALUE x, VALUE y)
{
double dx, dy;
if (y == INT2FIX(2)) {
dx = RFLOAT_VALUE(x);
return DBL2NUM(dx * dx);
}
else if (RB_TYPE_P(y, T_FIXNUM)) {
dx = RFLOAT_VALUE(x);
dy = (double)FIX2LONG(y);
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
dx = RFLOAT_VALUE(x);
dy = rb_big2dbl(y);
}
else if (RB_TYPE_P(y, T_FLOAT)) {
dx = RFLOAT_VALUE(x);
dy = RFLOAT_VALUE(y);
if (dx < 0 && dy != round(dy))
return rb_dbl_complex_new_polar_pi(pow(-dx, dy), dy);
}
else {
return rb_num_coerce_bin(x, y, idPow);
}
return DBL2NUM(pow(dx, dy));
}
float + other → float click to toggle source
Returns a new Float which is the sum of float and other.
VALUE
rb_float_plus(VALUE x, VALUE y)
{
if (RB_TYPE_P(y, T_FIXNUM)) {
return DBL2NUM(RFLOAT_VALUE(x) + (double)FIX2LONG(y));
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
return DBL2NUM(RFLOAT_VALUE(x) + rb_big2dbl(y));
}
else if (RB_TYPE_P(y, T_FLOAT)) {
return DBL2NUM(RFLOAT_VALUE(x) + RFLOAT_VALUE(y));
}
else {
return rb_num_coerce_bin(x, y, '+');
}
}
float - other → float click to toggle source
Returns a new Float which is the difference of float and other.
VALUE
rb_float_minus(VALUE x, VALUE y)
{
if (RB_TYPE_P(y, T_FIXNUM)) {
return DBL2NUM(RFLOAT_VALUE(x) - (double)FIX2LONG(y));
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
return DBL2NUM(RFLOAT_VALUE(x) - rb_big2dbl(y));
}
else if (RB_TYPE_P(y, T_FLOAT)) {
return DBL2NUM(RFLOAT_VALUE(x) - RFLOAT_VALUE(y));
}
else {
return rb_num_coerce_bin(x, y, '-');
}
}
-float → float click to toggle source
Returns float, negated.
VALUE
rb_float_uminus(VALUE flt)
{
return DBL2NUM(-RFLOAT_VALUE(flt));
}
float / other → float click to toggle source
Returns a new Float which is the result of dividing float by other.
VALUE
rb_float_div(VALUE x, VALUE y)
{
double num = RFLOAT_VALUE(x);
double den;
double ret;
if (RB_TYPE_P(y, T_FIXNUM)) {
den = FIX2LONG(y);
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
den = rb_big2dbl(y);
}
else if (RB_TYPE_P(y, T_FLOAT)) {
den = RFLOAT_VALUE(y);
}
else {
return rb_num_coerce_bin(x, y, '/');
}
ret = double_div_double(num, den);
return DBL2NUM(ret);
}
float < real → true or false click to toggle source
Returns true if float is less than real.
The result of NaN < NaN is undefined, so an implementation-dependent value is returned.
static VALUE
flo_lt(VALUE x, VALUE y)
{
double a, b;
a = RFLOAT_VALUE(x);
if (RB_TYPE_P(y, T_FIXNUM) || RB_TYPE_P(y, T_BIGNUM)) {
VALUE rel = rb_integer_float_cmp(y, x);
if (FIXNUM_P(rel))
return -FIX2LONG(rel) < 0 ? Qtrue : Qfalse;
return Qfalse;
}
else if (RB_TYPE_P(y, T_FLOAT)) {
b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
if (isnan(b)) return Qfalse;
#endif
}
else {
return rb_num_coerce_relop(x, y, '<');
}
#if MSC_VERSION_BEFORE(1300)
if (isnan(a)) return Qfalse;
#endif
return (a < b)?Qtrue:Qfalse;
}
float <= real → true or false click to toggle source
Returns true if float is less than or equal to real.
The result of NaN <= NaN is undefined, so an implementation-dependent value is returned.
static VALUE
flo_le(VALUE x, VALUE y)
{
double a, b;
a = RFLOAT_VALUE(x);
if (RB_TYPE_P(y, T_FIXNUM) || RB_TYPE_P(y, T_BIGNUM)) {
VALUE rel = rb_integer_float_cmp(y, x);
if (FIXNUM_P(rel))
return -FIX2LONG(rel) <= 0 ? Qtrue : Qfalse;
return Qfalse;
}
else if (RB_TYPE_P(y, T_FLOAT)) {
b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
if (isnan(b)) return Qfalse;
#endif
}
else {
return rb_num_coerce_relop(x, y, idLE);
}
#if MSC_VERSION_BEFORE(1300)
if (isnan(a)) return Qfalse;
#endif
return (a <= b)?Qtrue:Qfalse;
}
float <=> real → -1, 0, +1, or nil click to toggle source
Returns -1, 0, or +1 depending on whether float is less than, equal to, or greater than real. This is the basis for the tests in the Comparable module.
The result of NaN <=> NaN is undefined, so an implementation-dependent value is returned.
nil is returned if the two values are incomparable.
static VALUE
flo_cmp(VALUE x, VALUE y)
{
double a, b;
VALUE i;
a = RFLOAT_VALUE(x);
if (isnan(a)) return Qnil;
if (RB_TYPE_P(y, T_FIXNUM) || RB_TYPE_P(y, T_BIGNUM)) {
VALUE rel = rb_integer_float_cmp(y, x);
if (FIXNUM_P(rel))
return LONG2FIX(-FIX2LONG(rel));
return rel;
}
else if (RB_TYPE_P(y, T_FLOAT)) {
b = RFLOAT_VALUE(y);
}
else {
if (isinf(a) && (i = rb_check_funcall(y, rb_intern("infinite?"), 0, 0)) != Qundef) {
if (RTEST(i)) {
int j = rb_cmpint(i, x, y);
j = (a > 0.0) ? (j > 0 ? 0 : +1) : (j < 0 ? 0 : -1);
return INT2FIX(j);
}
if (a > 0.0) return INT2FIX(1);
return INT2FIX(-1);
}
return rb_num_coerce_cmp(x, y, id_cmp);
}
return rb_dbl_cmp(a, b);
}
float == obj → true or false click to toggle source
Returns true only if obj has the same value as float. Contrast this with Float#eql?, which requires obj to be a Float.
1.0 == 1
The result of NaN == NaN is undefined, so an implementation-dependent value is returned.
MJIT_FUNC_EXPORTED VALUE
rb_float_equal(VALUE x, VALUE y)
{
volatile double a, b;
if (RB_TYPE_P(y, T_FIXNUM) || RB_TYPE_P(y, T_BIGNUM)) {
return rb_integer_float_eq(y, x);
}
else if (RB_TYPE_P(y, T_FLOAT)) {
b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
if (isnan(b)) return Qfalse;
#endif
}
else {
return num_equal(x, y);
}
a = RFLOAT_VALUE(x);
#if MSC_VERSION_BEFORE(1300)
if (isnan(a)) return Qfalse;
#endif
return (a == b)?Qtrue:Qfalse;
}
Returns true only if obj has the same value as float. Contrast this with Float#eql?, which requires obj to be a Float.
1.0 == 1
The result of NaN == NaN is undefined, so an implementation-dependent value is returned.
float > real → true or false click to toggle source
Returns true if float is greater than real.
The result of NaN > NaN is undefined, so an implementation-dependent value is returned.
VALUE
rb_float_gt(VALUE x, VALUE y)
{
double a, b;
a = RFLOAT_VALUE(x);
if (RB_TYPE_P(y, T_FIXNUM) || RB_TYPE_P(y, T_BIGNUM)) {
VALUE rel = rb_integer_float_cmp(y, x);
if (FIXNUM_P(rel))
return -FIX2LONG(rel) > 0 ? Qtrue : Qfalse;
return Qfalse;
}
else if (RB_TYPE_P(y, T_FLOAT)) {
b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
if (isnan(b)) return Qfalse;
#endif
}
else {
return rb_num_coerce_relop(x, y, '>');
}
#if MSC_VERSION_BEFORE(1300)
if (isnan(a)) return Qfalse;
#endif
return (a > b)?Qtrue:Qfalse;
}
float >= real → true or false click to toggle source
Returns true if float is greater than or equal to real.
The result of NaN >= NaN is undefined, so an implementation-dependent value is returned.
static VALUE
flo_ge(VALUE x, VALUE y)
{
double a, b;
a = RFLOAT_VALUE(x);
if (RB_TYPE_P(y, T_FIXNUM) || RB_TYPE_P(y, T_BIGNUM)) {
VALUE rel = rb_integer_float_cmp(y, x);
if (FIXNUM_P(rel))
return -FIX2LONG(rel) >= 0 ? Qtrue : Qfalse;
return Qfalse;
}
else if (RB_TYPE_P(y, T_FLOAT)) {
b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
if (isnan(b)) return Qfalse;
#endif
}
else {
return rb_num_coerce_relop(x, y, idGE);
}
#if MSC_VERSION_BEFORE(1300)
if (isnan(a)) return Qfalse;
#endif
return (a >= b)?Qtrue:Qfalse;
}
abs → float click to toggle source
Returns the absolute value of float.
(-34.56).abs -34.56.abs 34.56.abs
Float#magnitude is an alias for Float#abs.
VALUE
rb_float_abs(VALUE flt)
{
double val = fabs(RFLOAT_VALUE(flt));
return DBL2NUM(val);
}
angle → 0 or float
Returns 0 if the value is positive, pi otherwise.
arg → 0 or float click to toggle source
Returns 0 if the value is positive, pi otherwise.
static VALUE
float_arg(VALUE self)
{
if (isnan(RFLOAT_VALUE(self)))
return self;
if (f_tpositive_p(self))
return INT2FIX(0);
return rb_const_get(rb_mMath, id_PI);
}
ceil([ndigits]) → integer or float click to toggle source
Returns the smallest number greater than or equal to float with a precision of ndigits decimal digits (default: 0).
When the precision is negative, the returned value is an integer with at least ndigits.abs trailing zeros.
Returns a floating point number when ndigits is positive, otherwise returns an integer.
1.2.ceil 2.0.ceil (-1.2).ceil (-2.0).ceil 1.234567.ceil(2) 1.234567.ceil(3) 1.234567.ceil(4) 1.234567.ceil(5) 34567.89.ceil(-5) 34567.89.ceil(-4) 34567.89.ceil(-3) 34567.89.ceil(-2) 34567.89.ceil(-1) 34567.89.ceil(0) 34567.89.ceil(1) 34567.89.ceil(2) 34567.89.ceil(3)
Note that the limited precision of floating point arithmetic might lead to surprising results:
(2.1 / 0.7).ceil
static VALUE
flo_ceil(int argc, VALUE *argv, VALUE num)
{
int ndigits = 0;
if (rb_check_arity(argc, 0, 1)) {
ndigits = NUM2INT(argv[0]);
}
return rb_float_ceil(num, ndigits);
}
coerce(numeric) → array click to toggle source
Returns an array with both numeric and float represented as Float objects.
This is achieved by converting numeric to a Float.
1.2.coerce(3) 2.5.coerce(1.1)
static VALUE
flo_coerce(VALUE x, VALUE y)
{
return rb_assoc_new(rb_Float(y), x);
}
denominator → integer click to toggle source
Returns the denominator (always positive). The result is machine dependent.
See also Float#numerator.
VALUE
rb_float_denominator(VALUE self)
{
double d = RFLOAT_VALUE(self);
VALUE r;
if (isinf(d) || isnan(d))
return INT2FIX(1);
r = float_to_r(self);
return nurat_denominator(r);
}
divmod(numeric) → array click to toggle source
See Numeric#divmod.
42.0.divmod(6) 42.0.divmod(5)
static VALUE
flo_divmod(VALUE x, VALUE y)
{
double fy, div, mod;
volatile VALUE a, b;
if (RB_TYPE_P(y, T_FIXNUM)) {
fy = (double)FIX2LONG(y);
}
else if (RB_TYPE_P(y, T_BIGNUM)) {
fy = rb_big2dbl(y);
}
else if (RB_TYPE_P(y, T_FLOAT)) {
fy = RFLOAT_VALUE(y);
}
else {
return rb_num_coerce_bin(x, y, id_divmod);
}
flodivmod(RFLOAT_VALUE(x), fy, &div, &mod);
a = dbl2ival(div);
b = DBL2NUM(mod);
return rb_assoc_new(a, b);
}
eql?(obj) → true or false click to toggle source
Returns true only if obj is a Float with the same value as float. Contrast this with Float#==, which performs type conversions.
1.0.eql?(1)
The result of NaN.eql?(NaN) is undefined, so an implementation-dependent value is returned.
MJIT_FUNC_EXPORTED VALUE
rb_float_eql(VALUE x, VALUE y)
{
if (RB_TYPE_P(y, T_FLOAT)) {
double a = RFLOAT_VALUE(x);
double b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
if (isnan(a) || isnan(b)) return Qfalse;
#endif
if (a == b)
return Qtrue;
}
return Qfalse;
}
fdiv(numeric) → float
Returns float / numeric, same as Float#/.
finite? → true or false click to toggle source
Returns true if float is a valid IEEE floating point number, i.e. it is not infinite and Float#nan? is false.
VALUE
rb_flo_is_finite_p(VALUE num)
{
double value = RFLOAT_VALUE(num);
#ifdef HAVE_ISFINITE
if (!isfinite(value))
return Qfalse;
#else
if (isinf(value) || isnan(value))
return Qfalse;
#endif
return Qtrue;
}
floor([ndigits]) → integer or float click to toggle source
Returns the largest number less than or equal to float with a precision of ndigits decimal digits (default: 0).
When the precision is negative, the returned value is an integer with at least ndigits.abs trailing zeros.
Returns a floating point number when ndigits is positive, otherwise returns an integer.
1.2.floor 2.0.floor (-1.2).floor (-2.0).floor 1.234567.floor(2) 1.234567.floor(3) 1.234567.floor(4) 1.234567.floor(5) 34567.89.floor(-5) 34567.89.floor(-4) 34567.89.floor(-3) 34567.89.floor(-2) 34567.89.floor(-1) 34567.89.floor(0) 34567.89.floor(1) 34567.89.floor(2) 34567.89.floor(3)
Note that the limited precision of floating point arithmetic might lead to surprising results:
(0.3 / 0.1).floor
static VALUE
flo_floor(int argc, VALUE *argv, VALUE num)
{
int ndigits = 0;
if (rb_check_arity(argc, 0, 1)) {
ndigits = NUM2INT(argv[0]);
}
return rb_float_floor(num, ndigits);
}
hash → integer click to toggle source
Returns a hash code for this float.
See also Object#hash.
static VALUE
flo_hash(VALUE num)
{
return rb_dbl_hash(RFLOAT_VALUE(num));
}
infinite? → -1, 1, or nil click to toggle source
Returns nil, -1, or 1 depending on whether the value is finite, -Infinity, or +Infinity.
(0.0).infinite? (-1.0/0.0).infinite? (+1.0/0.0).infinite?
VALUE
rb_flo_is_infinite_p(VALUE num)
{
double value = RFLOAT_VALUE(num);
if (isinf(value)) {
return INT2FIX( value < 0 ? -1 : 1 );
}
return Qnil;
}
Returns a string containing a representation of self. As well as a fixed or exponential form of the float, the call may return NaN, Infinity, and -Infinity.
modulo(other) → float
Returns the modulo after division of float by other.
6543.21.modulo(137) 6543.21.modulo(137.24)
nan? → true or false click to toggle source
Returns true if float is an invalid IEEE floating point number.
a = -1.0 a.nan? a = 0.0/0.0 a.nan?
static VALUE
flo_is_nan_p(VALUE num)
{
double value = RFLOAT_VALUE(num);
return isnan(value) ? Qtrue : Qfalse;
}
negative? → true or false click to toggle source
Returns true if float is less than 0.
static VALUE
flo_negative_p(VALUE num)
{
double f = RFLOAT_VALUE(num);
return f < 0.0 ? Qtrue : Qfalse;
}
next_float → float click to toggle source
Returns the next representable floating point number.
Float::MAX.next_float and Float::INFINITY.next_float is Float::INFINITY.
Float::NAN.next_float is Float::NAN.
For example:
0.01.next_float
1.0.next_float
100.0.next_float
0.01.next_float - 0.01
1.0.next_float - 1.0
100.0.next_float - 100.0
f = 0.01; 20.times { printf "%-20a %s\n", f, f.to_s; f = f.next_float }
f = 0.0
100.times { f += 0.1 }
f
10-f
10.0.next_float-10
(10-f)/(10.0.next_float-10)
(10-f)/(10*Float::EPSILON)
"%a" % 10
"%a" % f
static VALUE
flo_next_float(VALUE vx)
{
return flo_nextafter(vx, HUGE_VAL);
}
numerator → integer click to toggle source
Returns the numerator. The result is machine dependent.
n = 0.3.numerator d = 0.3.denominator n.fdiv(d)
See also Float#denominator.
VALUE
rb_float_numerator(VALUE self)
{
double d = RFLOAT_VALUE(self);
VALUE r;
if (isinf(d) || isnan(d))
return self;
r = float_to_r(self);
return nurat_numerator(r);
}
phase → 0 or float
Returns 0 if the value is positive, pi otherwise.
positive? → true or false click to toggle source
Returns true if float is greater than 0.
static VALUE
flo_positive_p(VALUE num)
{
double f = RFLOAT_VALUE(num);
return f > 0.0 ? Qtrue : Qfalse;
}
prev_float → float click to toggle source
Returns the previous representable floating point number.
(-Float::MAX).prev_float and (-Float::INFINITY).prev_float is -Float::INFINITY.
Float::NAN.prev_float is Float::NAN.
For example:
0.01.prev_float
1.0.prev_float
100.0.prev_float
0.01 - 0.01.prev_float
1.0 - 1.0.prev_float
100.0 - 100.0.prev_float
f = 0.01; 20.times { printf "%-20a %s\n", f, f.to_s; f = f.prev_float }
static VALUE
flo_prev_float(VALUE vx)
{
return flo_nextafter(vx, -HUGE_VAL);
}
quo(numeric) → float click to toggle source
Returns float / numeric, same as Float#/.
static VALUE
flo_quo(VALUE x, VALUE y)
{
return num_funcall1(x, '/', y);
}
rationalize([eps]) → rational click to toggle source
Returns a simpler approximation of the value (flt-|eps| <= result <= flt+|eps|). If the optional argument eps is not given, it will be chosen automatically.
0.3.rationalize 1.333.rationalize 1.333.rationalize(0.01)
See also Float#to_r.
static VALUE
float_rationalize(int argc, VALUE *argv, VALUE self)
{
double d = RFLOAT_VALUE(self);
VALUE rat;
int neg = d < 0.0;
if (neg) self = DBL2NUM(-d);
if (rb_check_arity(argc, 0, 1)) {
rat = rb_flt_rationalize_with_prec(self, argv[0]);
}
else {
rat = rb_flt_rationalize(self);
}
if (neg) RATIONAL_SET_NUM(rat, rb_int_uminus(RRATIONAL(rat)->num));
return rat;
}
round([ndigits] [, half: mode]) → integer or float click to toggle source
Returns float rounded to the nearest value with a precision of ndigits decimal digits (default: 0).
When the precision is negative, the returned value is an integer with at least ndigits.abs trailing zeros.
Returns a floating point number when ndigits is positive, otherwise returns an integer.
1.4.round 1.5.round 1.6.round (-1.5).round 1.234567.round(2) 1.234567.round(3) 1.234567.round(4) 1.234567.round(5) 34567.89.round(-5) 34567.89.round(-4) 34567.89.round(-3) 34567.89.round(-2) 34567.89.round(-1) 34567.89.round(0) 34567.89.round(1) 34567.89.round(2) 34567.89.round(3)
If the optional half keyword argument is given, numbers that are half-way between two possible rounded values will be rounded according to the specified tie-breaking mode:
:up or nil: round half away from zero (default)
:down: round half toward zero
:even: round half toward the nearest even number
2.5.round(half: :up) 2.5.round(half: :down) 2.5.round(half: :even) 3.5.round(half: :up) 3.5.round(half: :down) 3.5.round(half: :even) (-2.5).round(half: :up) (-2.5).round(half: :down) (-2.5).round(half: :even)
static VALUE
flo_round(int argc, VALUE *argv, VALUE num)
{
double number, f, x;
VALUE nd, opt;
int ndigits = 0;
enum ruby_num_rounding_mode mode;
if (rb_scan_args(argc, argv, "01:", &nd, &opt)) {
ndigits = NUM2INT(nd);
}
mode = rb_num_get_rounding_option(opt);
number = RFLOAT_VALUE(num);
if (number == 0.0) {
return ndigits > 0 ? DBL2NUM(number) : INT2FIX(0);
}
if (ndigits < 0) {
return rb_int_round(flo_to_i(num), ndigits, mode);
}
if (ndigits == 0) {
x = ROUND_CALL(mode, round, (number, 1.0));
return dbl2ival(x);
}
if (isfinite(number)) {
int binexp;
frexp(number, &binexp);
if (float_round_overflow(ndigits, binexp)) return num;
if (float_round_underflow(ndigits, binexp)) return DBL2NUM(0);
f = pow(10, ndigits);
x = ROUND_CALL(mode, round, (number, f));
return DBL2NUM(x / f);
}
return num;
}
to_d → bigdecimal click to toggle source
to_d(precision) → bigdecimal
Returns the value of float as a BigDecimal. The precision parameter is used to determine the number of significant digits for the result (the default is Float::DIG).
require 'bigdecimal' require 'bigdecimal/util' 0.5.to_d 1.234.to_d(2)
See also BigDecimal::new.
def to_d(precision=Float::DIG+1) BigDecimal(self, precision) end
to_f → self click to toggle source
Since float is already a Float, returns self.
static VALUE
flo_to_f(VALUE num)
{
return num;
}
to_i → integer click to toggle source
Returns the float truncated to an Integer.
1.2.to_i (-1.2).to_i
Note that the limited precision of floating point arithmetic might lead to surprising results:
(0.3 / 0.1).to_i
static VALUE
flo_to_i(VALUE num)
{
double f = RFLOAT_VALUE(num);
if (f > 0.0) f = floor(f);
if (f < 0.0) f = ceil(f);
return dbl2ival(f);
}
Returns the float truncated to an Integer.
1.2.to_i (-1.2).to_i
Note that the limited precision of floating point arithmetic might lead to surprising results:
(0.3 / 0.1).to_i
to_r → rational click to toggle source
Returns the value as a rational.
2.0.to_r 2.5.to_r -0.75.to_r 0.0.to_r 0.3.to_r
NOTE: 0.3.to_r isn't the same as â0.3â.to_r. The latter is equivalent to â3/10â.to_r, but the former isn't so.
0.3.to_r == 3/10r "0.3".to_r == 3/10r
See also Float#rationalize.
static VALUE
float_to_r(VALUE self)
{
VALUE f;
int n;
float_decode_internal(self, &f, &n);
#if FLT_RADIX == 2
if (n == 0)
return rb_rational_new1(f);
if (n > 0)
return rb_rational_new1(rb_int_lshift(f, INT2FIX(n)));
n = -n;
return rb_rational_new2(f, rb_int_lshift(ONE, INT2FIX(n)));
#else
f = rb_int_mul(f, rb_int_pow(INT2FIX(FLT_RADIX), n));
if (RB_TYPE_P(f, T_RATIONAL))
return f;
return rb_rational_new1(f);
#endif
}
to_s → string click to toggle source
Returns a string containing a representation of self. As well as a fixed or exponential form of the float, the call may return NaN, Infinity, and -Infinity.
static VALUE
flo_to_s(VALUE flt)
{
enum {decimal_mant = DBL_MANT_DIG-DBL_DIG};
enum {float_dig = DBL_DIG+1};
char buf[float_dig + (decimal_mant + CHAR_BIT - 1) / CHAR_BIT + 10];
double value = RFLOAT_VALUE(flt);
VALUE s;
char *p, *e;
int sign, decpt, digs;
if (isinf(value)) {
static const char minf[] = "-Infinity";
const int pos = (value > 0); /* skip "-" */
return rb_usascii_str_new(minf+pos, strlen(minf)-pos);
}
else if (isnan(value))
return rb_usascii_str_new2("NaN");
p = ruby_dtoa(value, 0, 0, &decpt, &sign, &e);
s = sign ? rb_usascii_str_new_cstr("-") : rb_usascii_str_new(0, 0);
if ((digs = (int)(e - p)) >= (int)sizeof(buf)) digs = (int)sizeof(buf) - 1;
memcpy(buf, p, digs);
xfree(p);
if (decpt > 0) {
if (decpt < digs) {
memmove(buf + decpt + 1, buf + decpt, digs - decpt);
buf[decpt] = '.';
rb_str_cat(s, buf, digs + 1);
}
else if (decpt <= DBL_DIG) {
long len;
char *ptr;
rb_str_cat(s, buf, digs);
rb_str_resize(s, (len = RSTRING_LEN(s)) + decpt - digs + 2);
ptr = RSTRING_PTR(s) + len;
if (decpt > digs) {
memset(ptr, '0', decpt - digs);
ptr += decpt - digs;
}
memcpy(ptr, ".0", 2);
}
else {
goto exp;
}
}
else if (decpt > -4) {
long len;
char *ptr;
rb_str_cat(s, "0.", 2);
rb_str_resize(s, (len = RSTRING_LEN(s)) - decpt + digs);
ptr = RSTRING_PTR(s);
memset(ptr += len, '0', -decpt);
memcpy(ptr -= decpt, buf, digs);
}
else {
goto exp;
}
return s;
exp:
if (digs > 1) {
memmove(buf + 2, buf + 1, digs - 1);
}
else {
buf[2] = '0';
digs++;
}
buf[1] = '.';
rb_str_cat(s, buf, digs + 1);
rb_str_catf(s, "e%+03d", decpt - 1);
return s;
}
truncate([ndigits]) → integer or float click to toggle source
Returns float truncated (toward zero) to a precision of ndigits decimal digits (default: 0).
When the precision is negative, the returned value is an integer with at least ndigits.abs trailing zeros.
Returns a floating point number when ndigits is positive, otherwise returns an integer.
2.8.truncate (-2.8).truncate 1.234567.truncate(2) 34567.89.truncate(-2)
Note that the limited precision of floating point arithmetic might lead to surprising results:
(0.3 / 0.1).truncate
static VALUE
flo_truncate(int argc, VALUE *argv, VALUE num)
{
if (signbit(RFLOAT_VALUE(num)))
return flo_ceil(argc, argv, num);
else
return flo_floor(argc, argv, num);
}
zero? → true or false click to toggle source
Returns true if float is 0.0.
static VALUE
flo_zero_p(VALUE num)
{
return flo_iszero(num) ? Qtrue : Qfalse;
}
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