Added go version of Change

00_Alternate_Languages/22_Change/go/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"os"
+	"strconv"
+)
+
+func printWelcome() {
+	fmt.Println("                 CHANGE")
+	fmt.Println("CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY")
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+	fmt.Println("I, YOUR FRIENDLY MICROCOMPUTER, WILL DETERMINE")
+	fmt.Println("THE CORRECT CHANGE FOR ITEMS COSTING UP TO $100.")
+	fmt.Println()
+}
+
+func computeChange(cost, payment float64) {
+	change := int(math.Round((payment - cost) * 100))
+
+	if change == 0 {
+		fmt.Println("\nCORRECT AMOUNT, THANK YOU.")
+		return
+	}
+
+	if change < 0 {
+		fmt.Printf("\nSORRY, YOU HAVE SHORT-CHANGED ME $%0.2f\n", float64(change)/-100.0)
+		print()
+		return
+	}
+
+	fmt.Printf("\nYOUR CHANGE, $%0.2f:\n", float64(change)/100.0)
+
+	d := change / 1000
+	if d > 0 {
+		fmt.Printf("  %d TEN DOLLAR BILL(S)\n", d)
+		change -= d * 1000
+	}
+
+	d = change / 500
+	if d > 0 {
+		fmt.Printf("  %d FIVE DOLLAR BILL(S)\n", d)
+		change -= d * 500
+	}
+
+	d = change / 100
+	if d > 0 {
+		fmt.Printf("  %d ONE DOLLAR BILL(S)\n", d)
+		change -= d * 100
+	}
+
+	d = change / 50
+	if d > 0 {
+		fmt.Println("  1 HALF DOLLAR")
+		change -= d * 50
+	}
+
+	d = change / 25
+	if d > 0 {
+		fmt.Printf("  %d QUARTER(S)\n", d)
+		change -= d * 25
+	}
+
+	d = change / 10
+	if d > 0 {
+		fmt.Printf("  %d DIME(S)\n", d)
+		change -= d * 10
+	}
+
+	d = change / 5
+	if d > 0 {
+		fmt.Printf("  %d NICKEL(S)\n", d)
+		change -= d * 5
+	}
+
+	if change > 0 {
+		fmt.Printf("  %d PENNY(S)\n", change)
+	}
+}
+
+func main() {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	printWelcome()
+
+	var cost, payment float64
+	var err error
+	for {
+		fmt.Println("COST OF ITEM?")
+		scanner.Scan()
+		cost, err = strconv.ParseFloat(scanner.Text(), 64)
+		if err != nil || cost < 0.0 {
+			fmt.Println("INVALID INPUT. TRY AGAIN.")
+			continue
+		}
+		break
+	}
+	for {
+		fmt.Println("\nAMOUNT OF PAYMENT?")
+		scanner.Scan()
+		payment, err = strconv.ParseFloat(scanner.Text(), 64)
+		if err != nil {
+			fmt.Println("INVALID INPUT. TRY AGAIN.")
+			continue
+		}
+		break
+	}
+
+	computeChange(cost, payment)
+	fmt.Println()
+}