Go Floating Point

External

• https://go.dev/ref/spec#Numeric_types

Internal

• Go Language

Overview

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

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

Printing Floating Point Numbers with fmt.Printf()

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)