Union Trick - Dynamic value interpretation

binary-conversion.go

package main

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"math"
)

func main() {
	x := uint64(4600000000000000000)

	fmt.Println(x)
	fmt.Println(math.Float64frombits(x))
}

union-trick.c

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>


// Bit-wise conversion of an int type to a floating point type.
int main(int argc, char const *argv[]) {
    union {
        uint64_t int_val;
        double double_val;
    } conv;

    conv.int_val = 4600000000000000000;

    printf("Int Val: %"PRIu64"\n", conv.int_val);
    printf("Double Val: %g\n", conv.double_val);

    return 0;
}