How to Convert Hexadecimal Strings to IEEE-754 Floats in Go?

Converting Hexadecimal to IEEE-754 Float

To convert hexadecimal strings like "0xC40C5253" to IEEE-754 float values, the standard strconv.ParseFloat function is not sufficient. This article explores alternative methods to achieve this conversion.

First, determine the bit-length of the input. In this case, with 8 hex digits, it's likely a 32-bit float (though confirmation from the user is recommended).

Using strconv.ParseUint and Unsafe Conversion:

• Use strconv.ParseUint() to parse the hex string as a 32-bit unsigned integer (uint32).
• Convert the uint64 result to uint32 to match the size of float32.
• Utilize the unsafe package to interpret the bytes of the uint32 as the bytes of a float32.

Code:

s := "C40C5253"
n, err := strconv.ParseUint(s, 16, 32)
if err != nil {
    panic(err)
}
n2 := uint32(n)
f := *(*float32)(unsafe.Pointer(&n2))

Alternative Using math.Float32frombits:

The math package provides a built-in function Float32frombits() that directly converts a uint32 to a float32.

Code:

f := math.Float32frombits(n2)

Usage:

With either method, you can now access the float value stored in f. For example:

fmt.Println(f) // Output: -561.2863

The above is the detailed content of How to Convert Hexadecimal Strings to IEEE-754 Floats in Go?. For more information, please follow other related articles on the PHP Chinese website!