How to convert hex to float

Question

I have to convert hex, represeneted as strings (e.g. \"0xC40C5253\") to float values (IEEE-754 conversion). I did not manage

Answer 1

The input is 32 bits, so must be treated as a 32-bit number. It is also unsigned, so should be parsed as a uint, not int. Finally, there is no need to use unsafe operations, and in fact as used here they will fail on a machine with a different byte order.

Instead, use math.Float32frombits, which does exactly what you want:

package main

import (
    "fmt"
    "math"
    "strconv"
)

func main() {
    s := "C40C5253"
    n, err := strconv.ParseUint(s, 16, 32)
    if err != nil {
        panic(err)
    }

    nn := uint32(n)

    g := math.Float32frombits(nn)
    fmt.Println(g)
}

Output:

-561.2863

http://play.golang.org/p/y1ZjH9pscy