Maximum value for float64 and complex128 of type Go

For example,

package main

import (
    "fmt"
    "math"
)

func main() {
    const f = math.MaxFloat64
    fmt.Printf("%[1]T %[1]v\n", f)
    const c = complex(math.MaxFloat64, math.MaxFloat64)
    fmt.Printf("%[1]T %[1]v\n", c)
}

      

        
        
        
      

    

Output:

float64 1.7976931348623157e+308
complex128 (1.7976931348623157e+308+1.7976931348623157e+308i)

      

        
        
        
      

    

Package math

import "math" 

      

        
        
        
      

    

Floating point limits. Max is the largest final value the type represents. SmallestNonzero The smallest positive, nonzero value that the type represents.

const (
        MaxFloat32             = 3.40282346638528859811704183484516925440e+38  // 2**127 * (2**24 - 1) / 2**23
        SmallestNonzeroFloat32 = 1.401298464324817070923729583289916131280e-45 // 1 / 2**(127 - 1 + 23)

        MaxFloat64             = 1.797693134862315708145274237317043567981e+308 // 2**1023 * (2**53 - 1) / 2**52
        SmallestNonzeroFloat64 = 4.940656458412465441765687928682213723651e-324 // 1 / 2**(1023 - 1 + 52)
)

      

        
        
        
      

    

Go programming language specification

Numeric types

Numeric type represents integers or floating point values. Pre-expressed architecture independent numeric types:

uint8       the set of all unsigned  8-bit integers (0 to 255)
uint16      the set of all unsigned 16-bit integers (0 to 65535)
uint32      the set of all unsigned 32-bit integers (0 to 4294967295)
uint64      the set of all unsigned 64-bit integers (0 to 18446744073709551615)

int8        the set of all signed  8-bit integers (-128 to 127)
int16       the set of all signed 16-bit integers (-32768 to 32767)
int32       the set of all signed 32-bit integers (-2147483648 to 2147483647)
int64       the set of all signed 64-bit integers (-9223372036854775808 to 9223372036854775807)

float32     the set of all IEEE-754 32-bit floating-point numbers
float64     the set of all IEEE-754 64-bit floating-point numbers

complex64   the set of all complex numbers with float32 real and imaginary parts
complex128  the set of all complex numbers with float64 real and imaginary parts

byte        alias for uint8
rune        alias for int32

      

        
        
        
      

    

The value of an n-bit integer is n bits and is represented using two arithmetic.

There is also a set of predefined numeric types with specific implementation sizes:

uint     either 32 or 64 bits
int      same size as uint
uintptr  an unsigned integer large enough to store the uninterpreted bits of a pointer value

      

        
        
        
      

    

To avoid portability issues, all numeric types are different except for byte, which is an alias for uint8, and a rune, which is an alias for int32. Conversions are required when mixing different numeric types in an expression or assignment. For example, int32 and int are not the same type, even though they may be the same size for a particular architecture.