test math/bits

playground/p13/p13.go

@@ -0,0 +1,35 @@
+// Copyright 2020, Chef.  All rights reserved.
+// https://github.com/q191201771/naza
+//
+// Use of this source code is governed by a MIT-style license
+// that can be found in the License file.
+//
+// Author: Chef ([email protected])
+
+package main
+
+import (
+	"fmt"
+	"math/bits"
+)
+
+func main() {
+	var a uint32
+	a = 1
+	fmt.Printf("%032b\n", a)
+	fmt.Printf("%032b\n", bits.ReverseBytes32(a))
+	a = a << 8
+	fmt.Printf("%032b\n", a)
+	fmt.Printf("%032b\n", bits.ReverseBytes32(a))
+
+	var b uint64
+	b = 1
+	fmt.Printf("%064b\n", b)
+	fmt.Printf("%064b\n", bits.ReverseBytes64(b))
+	b = b << 8
+	fmt.Printf("%064b\n", b)
+	fmt.Printf("%064b\n", bits.ReverseBytes64(b))
+	b = b << 8
+	fmt.Printf("%064b\n", b)
+	fmt.Printf("%064b\n", bits.ReverseBytes64(b))
+}