在Golang中将一个指针转换为另一种类型

Question

I want to convert a float64 number into int64 number. That is, I want to read the binary contents of the float64 register as if it is a int64 value. I mean, I want the go equivalent of the following C code

long y;
float x = 1.2;
y  = * ( long * ) &x;

How do I do that?

Here is my try which is not working.

package main

import (
    "fmt"
)

func main() {

    x := float64(1.2)
    y := *((*int64)(&x))

    fmt.Println("Ans:  ", y)

}

Answer 1

That is, I want to read the binary contents of the float64 register as if it is a int64 value.

Try math.Float64bits:

x := float64(1.2)
fmt.Printf("Ans:  %x", math.Float64bits(x))

https://play.golang.org/p/QB4jqwJD0f

Prints Ans: 3ff3333333333333.