Breakdown of float32 (IEEE 754 single-precision binary floating-point format)

float32debug.go

package main

import (
	"fmt"
	"math"
)
const float32MantissaMask =   0x7FFFFF
const float32ExponentMask = 0x7F800000
const float32SignMask     = 0x80000000
const float32ExponentBitOffset = 23
const float32ExponentValueOffset = -127
const float32SignOffset = 31

func main() {
	floatDebug(3.14159)
}

func floatDebug(bar float32) {
	barBits := math.Float32bits(bar)
	fmt.Printf("Value    : %f\n", bar)
	fmt.Printf("Bits     : %X\n", barBits)
	fmt.Printf("Mantissa : %X\n", barBits & float32MantissaMask)
	fmt.Printf("Exponent : %X\n", (int64(barBits & float32ExponentMask) >> float32ExponentBitOffset) + float32ExponentValueOffset)
	fmt.Printf("Sign     : %X\n", (barBits & float32SignMask) >> float32SignOffset)
}