Latest revision as of 04:02, 23 August 2023

External

Floating-point numbers are designated by the following pre-declared type identifiers:

Single precision float32 4 bytes IEEE-754 binary floating point, approximately 6 digits of precision.
Double precision float64, 15 digits of precision.
Complex: complex64 and complex128.

There is no float, as in the integer case, we must explicitly provide the precision.

Uninitialized variable value: +0.000000e+000

Decimals:

var x float = 123.45

Scientific notation, with exponent in base 10:

var x float = 1.23e3

Printing Floating Point Numbers with fmt.Printf()

Floating point can be truncated by converting them to int:

f := 1.0
i := int(f)

var z complex128 = complex(2, 3)

@@ Line 1: / Line 1: @@
+=External=
+* https://go.dev/ref/spec#Numeric_types
 =Internal=
+* [[Go_Language#Floating_Point|Go Language]]
+=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.
-=Overview=
 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>