Add test

Author: itsubaki

math/number/parse.go

@@ -1,14 +1,6 @@
 package number
 
-import (
-	"math"
-	"strconv"
-)
-
-// Ldexp returns a * 2**b.
-func Ldexp(a, b int) float64 {
-	return math.Ldexp(float64(a), b)
-}
+import "strconv"
 
 // MustParseInt returns int from binary string.
 // It panics if error occurs.

math/number/pow.go

@@ -1,5 +1,12 @@
 package number
 
+import "math"
+
+// Ldexp returns a * 2**b.
+func Ldexp(a, b int) float64 {
+	return math.Ldexp(float64(a), b)
+}
+
 // Pow returns a**r, the base-a exponential of r.
 func Pow(a, r int) int {
 	if a == 0 {

math/number/pow_test.go

@@ -7,6 +7,17 @@ import (
 	"github.com/itsubaki/q/math/number"
 )
 
+func ExampleLdexp() {
+	fmt.Println(number.Ldexp(1, -2))
+	fmt.Println(number.Ldexp(3, -2))
+	fmt.Println(number.Ldexp(3, 4))
+
+	// Output:
+	// 0.25
+	// 0.75
+	// 48
+}
+
 func ExampleBaseExp() {
 	a, b, ok := number.BaseExp(125)
 	fmt.Printf("%v^%v %v", a, b, ok)