<float> Class Reference

Methods in this pseudo-class can be executed on floating-point values. More...

#include <Pseudo_QC_Float.dox.h>

Inheritance diagram for Qore::<float>:

Public Member Methods
float	abs ()
	Returns the absolute value of the number. More...
string	format (string fmt)
	Returns a string of a formatted number according to a format string. More...
string	format (int prec=2, string decimal_sep=".", string thousands_sep="")
	Returns a formatted string of the floating-point number according to format arguments. More...
bool	infp ()
	Returns True if the number is infinity (+ or -) More...
bool	intp ()
	Returns True because float values can be converted to integers. More...
bool	nanp ()
	Returns True if the number is NaN (not a number) More...
int	sign ()
	Returns -1 if the number is negative, 0 if it is zero, or 1 if it is positive. More...
bool	strp ()
	Returns True because float values can be converted to strings. More...
string	toBase (int base=10)
	Converts the number to a different base (and returns it as a string). More...
int	typeCode ()
	Returns Qore::NT_FLOAT. More...
bool	val ()
	Returns True if the float is non-zero, False if zero. More...
Public Member Methods inherited from <value>
bool	callp ()
	Returns False; this method is reimplemented in other types and will return True if the given expression is a callable value (ie closures or call references) More...
bool	complexType ()
	returns True if the value has a complex type, False if not More...
bool	empty ()
	Returns True; this method will be reimplemented in container types where it may return False. More...
string	fullType (*bool with_namespaces)
	returns the full type name which differs from the simple type name in case of complex types and objects More...
bool	intp ()
	Returns False; this method is reimplemented in other types and will return True if the given expression can be converted to an integer. More...
AbstractIterator	iterator ()
	Returns an iterator object for the value; the default iterator object returned is SingleValueIterator. More...
int	lsize ()
	Returns 1; the return value of this method should give the list size of the value, which is normally 1 for non-lists (except for NOTHING where the size will be 0) and the number of the elements in the list for lists; this method will be reimplemented in other types where it may return other values. More...
int	size ()
	Returns zero; this method will be reimplemented in container types where it may return a non-zero value. More...
bool	sizep ()
	Returns True if the type can return a non-zero size (True for containers including binary objects and strings, False for everything else) More...
bool	strp ()
	Returns False; this method is reimplemented in other types and will return True if the given expression can be converted to a string. More...
bool	toBool ()
	Returns the boolean representation of the value; the default is False. More...
float	toFloat ()
	Returns the floating-point representation of the value; the default is 0.0. More...
int	toInt ()
	Returns the integer representation of the value; the default is 0. More...
number	toNumber ()
	Returns the arbitrary-precision numeric representation of the value; the default is 0. More...
string	toString ()
	Returns the string representation of the value; the default is an empty string. More...
string	type ()
	Returns the string type for the value. More...
int	typeCode ()
	Returns the type code for the value. More...
bool	val ()
	Returns False; this method is reimplemented in other types and will return True if the given expression has a non-empty value. More...

Detailed Description

Methods in this pseudo-class can be executed on floating-point values.

Member Function Documentation

abs()

float <float>::abs

(

)

Returns the absolute value of the number.

Code Flags:

CONSTANT

Example:

f = f.abs();

Returns

the absolute value of the number

Note

equivalent to abs(float)

Since

Qore 0.8.8

format() [1/2]

string <float>::format	(	int	prec = 2,
		string	decimal_sep = ".",
		string	thousands_sep = ""
	)

Returns a formatted string of the floating-point number according to format arguments.

Code Flags:

RET_VALUE_ONLY

Parameters

prec	the number of digits after the decimal point; a negative value means to round that number of digits before the decimal place, whereas the special constant SNF_AllDigits means to include all possible digits after the decimal point
decimal_sep	a single character that defines the decimal separator; an empty string means no decimal separator
thousands_sep	a single character that defines the thousands and further separators every three digits before the decimal point; an empty string means no thousands separator

Returns

a string representing the floating-point number according to the format arguments as described above

Example:

number n = -48392093894.2349n;
string nstr = n.format(3, ".", ","); # returns "-48.392.093.894,235"

See also

• <number>::format(int, string, string)
• <int>::format(int, string, string)
• <number>::format(string)
• <float>::format(string)
• <int>::format(string)

Since

Qore 0.8.13

format() [2/2]

string <float>::format

(

string

fmt

)

Returns a string of a formatted number according to a format string.

Code Flags:

CONSTANT

Parameters

fmt

the format string has the following format: <thousands_separator>[<decimal_separator>[<decimals>]] where: thousands_separator and decimal_separator are single characters defining the thousands and decimal separator characters respectively, and decimals is one or more digits defining how may decimals should appear after the decimal point; a negative number means to round that number of digits before the decimal place

Returns

a string of a formatted number according to a format string; if the format string does not follow the given format, then the number without formatting is returned

Example:

float f = -48392093894.2349;
string nstr = f.format(".,3"); # returns "-48.392.093.894,235"

Note

equivalent to format_number(string, softfloat)

See also

• <int>::format(string)
• <number>::format(string)
• <int>::format(int, string, string)
• <float>::format(int, string, string)
• <number>::format(int, string, string)

Since

Qore 0.8.6

infp()

bool <float>::infp

(

)

Returns True if the number is infinity (+ or -)

Returns

True if the number is infinity (+ or -)

Code Flags:

CONSTANT

Example:

if (f.infp())
    print("the operation resulted in infinity\n");

Since

Qore 0.8.12

intp()

bool <float>::intp

(

)

Returns True because float values can be converted to integers.

Returns

True because float values can be converted to integers

Code Flags:

CONSTANT

Example:

if (n.intp())
    printf("%y: can be converted to an integer: %d\n", n, int(n));

nanp()

bool <float>::nanp

(

)

Returns True if the number is NaN (not a number)

Returns

True if the number is NaN (not a number)

Code Flags:

CONSTANT

Example:

if (f.nanp())
    print("the operation resulted in NaN\n");

Since

Qore 0.8.12

sign()

int <float>::sign

(

)

Returns -1 if the number is negative, 0 if it is zero, or 1 if it is positive.

Returns

-1 if the number is negative, 0 if it is zero, or 1 if it is positive

Code Flags:

CONSTANT

Example:

printf("sign: %d\n", f.sign());

Since

Qore 0.8.6

strp()

bool <float>::strp

(

)

Returns True because float values can be converted to strings.

Returns

True because float values can be converted to strings

Code Flags:

CONSTANT

Example:

if (n.strp())
    printf("%y: can be converted to a string: '%s'\n", n, string(n));

toBase()

string <float>::toBase

(

int

base = 10

)

Converts the number to a different base (and returns it as a string).

Code Flags:

RET_VALUE_ONLY

Parameters

base	the base to convert the number to; this value must be 2 - 36 inclusive or an INVALID-BASE exception will be thrown

Returns

the converted value as a string

Example:

 (15.5).toBase(20));   // returns "F.A"
(-13.8).toBase(20));   // returns "-D.G"
(21.48).toBase(15));   // returns "16.73"

Exceptions

INVALID-BASE

the base is invalid; must be 2 - 36 inclusive

See also

<int>::toBase(int base)

<number>::toBase(int base)

Since

Qore 0.8.13

typeCode()

int <float>::typeCode

(

)

Returns Qore::NT_FLOAT.

Returns

Qore::NT_FLOAT

Code Flags:

CONSTANT

Example:

switch (f.typeCode()) {
    case NT_FLOAT:
        printf("%y: is a float\n", f);
        break;
}

val()

bool <float>::val

(

)

Returns True if the float is non-zero, False if zero.

Returns

True if the float is non-zero, False if zero

Code Flags:

CONSTANT

Example:

bool b = f.val();

See also

• %perl-bool-eval
• %strict-bool-eval