Go Floating Point: Difference between revisions
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=External= | |||
* https://go.dev/ref/spec#Numeric_types | |||
=Internal= | =Internal= | ||
* [[Go_Language#Floating_Point|Go Language]] | * [[Go_Language#Floating_Point|Go Language]] | ||
=Overview= | =Overview= | ||
Floating-point numbers are designated by the following [[Go_Language#Pre-Declared_Types|pre-declared type identifiers]]: | |||
* Single precision <code>float32</code> 4 bytes IEEE-754 binary floating point, approximately 6 digits of precision. | |||
* Double precision <code>float64</code>, 15 digits of precision. | |||
* Complex: <code>complex64</code> and <code>complex128</code>. | |||
There is no <code>float</code>, as in the integer case, we must explicitly provide the precision. | |||
Uninitialized variable value: <code>+0.000000e+000</code> | Uninitialized variable value: <code>+0.000000e+000</code> | ||
=Floating-Point Literals= | |||
Decimals: | |||
<syntaxhighlight lang='go'> | |||
var x float = 123.45 | |||
</syntaxhighlight> | |||
Scientific notation, with exponent in base 10: | |||
<syntaxhighlight lang='go'> | |||
var x float = 1.23e3 | |||
</syntaxhighlight> | |||
=Printing Floating Point Numbers= | |||
{{Internal|Go_Printing_to_Stdout_and_Stderr#Floating_Point_Numbers|Printing Floating Point Numbers with <tt>fmt.Printf()</tt>}} | |||
=Type Conversion to <tt>int</tt>= | |||
Floating point can be truncated by converting them to <code>int</code>: | |||
<syntaxhighlight lang='go'> | |||
f := 1.0 | |||
i := int(f) | |||
</syntaxhighlight> | |||
=Complex Numbers= | |||
<syntaxhighlight lang='go'> | |||
var z complex128 = complex(2, 3) | |||
</syntaxhighlight> | |||
Latest revision as of 04:02, 23 August 2023
External
Internal
Overview
Floating-point numbers are designated by the following pre-declared type identifiers:
- Single precision
float324 bytes IEEE-754 binary floating point, approximately 6 digits of precision. - Double precision
float64, 15 digits of precision. - Complex:
complex64andcomplex128.
There is no float, as in the integer case, we must explicitly provide the precision.
Uninitialized variable value: +0.000000e+000
Floating-Point Literals
Decimals:
var x float = 123.45
Scientific notation, with exponent in base 10:
var x float = 1.23e3
Printing Floating Point Numbers
Type Conversion to int
Floating point can be truncated by converting them to int:
f := 1.0
i := int(f)
Complex Numbers
var z complex128 = complex(2, 3)