Add testable example for UnitConversions

Fix imports, fix output pretty print

Use btcutil.Amount() instead of btcutil.NewAmount()

Trim off unnecessary .String()

Testable example for Amount

Improve example for btcutil.Amount

example_test.go

@@ -4,32 +4,48 @@ import (
 	"fmt"
 	"math"
 
-	. "github.com/btcsuite/btcutil"
+	"github.com/btcsuite/btcutil"
 )
 
+func ExampleAmount() {
+
+	a := btcutil.Amount(0)
+	fmt.Println("Zero Satoshi:", a)
+
+	a = btcutil.Amount(1e8)
+	fmt.Println("100,000,000 Satoshis:", a)
+
+	a = btcutil.Amount(1e5)
+	fmt.Println("100,000 Satoshis:", a)
+	// Output:
+	// Zero Satoshi: 0 BTC
+	// 100,000,000 Satoshis: 1 BTC
+	// 100,000 Satoshis: 0.001 BTC
+}
+
 func ExampleNewAmount() {
-	amountOne, err := NewAmount(1)
+	amountOne, err := btcutil.NewAmount(1)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 	fmt.Println(amountOne) //Output 1
 
-	amountFraction, err := NewAmount(0.01234567)
+	amountFraction, err := btcutil.NewAmount(0.01234567)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 	fmt.Println(amountFraction) //Output 2
 
-	amountZero, err := NewAmount(0)
+	amountZero, err := btcutil.NewAmount(0)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 	fmt.Println(amountZero) //Output 3
 
-	amountNaN, err := NewAmount(math.NaN())
+	amountNaN, err := btcutil.NewAmount(math.NaN())
 	if err != nil {
 		fmt.Println(err)
 		return
@@ -41,3 +57,20 @@ func ExampleNewAmount() {
 	// 0 BTC
 	// invalid bitcoin amount
 }
+
+func ExampleAmount_unitConversions() {
+	amount := btcutil.Amount(44433322211100)
+
+	fmt.Println("Satoshi to kBTC:", amount.Format(btcutil.AmountKiloBTC))
+	fmt.Println("Satoshi to BTC:", amount)
+	fmt.Println("Satoshi to MilliBTC:", amount.Format(btcutil.AmountMilliBTC))
+	fmt.Println("Satoshi to MicroBTC:", amount.Format(btcutil.AmountMicroBTC))
+	fmt.Println("Satoshi to Satoshi:", amount.Format(btcutil.AmountSatoshi))
+
+	// Output:
+	// Satoshi to kBTC: 444.333222111 kBTC
+	// Satoshi to BTC: 444333.222111 BTC
+	// Satoshi to MilliBTC: 444333222.111 mBTC
+	// Satoshi to MicroBTC: 444333222111 μBTC
+	// Satoshi to Satoshi: 44433322211100 Satoshi
+}