pointers

bank/bank.go

@@ -1,36 +1,17 @@
 package main
 
-import "errors"
+import (
-import "fmt"
+	"example.com/bank/fileops"
-import "os"
+	"fmt"
-import "strconv"
+	"github.com/Pallinder/go-randomdata"
+)
 
 const accountBalanceFile = "balance.txt"
 
-func getBalanceFromFile() (float64, error) {
-	data, err := os.ReadFile(accountBalanceFile, )
 
-	if err != nil {
-		return 1000, errors.New("Failed to find balance file.")
-	}
-	
-	balanceText := string(data)
-	balance, err :=strconv.ParseFloat(balanceText, 64)
-
-	if err != nil {
-		return 1000, errors.New("Failed to parse stored balance value.")
-	}
-
-	return balance, nil
-}
-
-func writeBalanceToFile(balance float64) {
-	balanceText := fmt.Sprint(balance)
-	os.WriteFile(accountBalanceFile, []byte(balanceText), 0644)
-}
 
 func main() {
-	var accountBalance, err = getBalanceFromFile()
+	var accountBalance, err = fileops.GetFloatFromFile(accountBalanceFile)
 
 	if err != nil {
 		fmt.Println("ERROR")
@@ -39,13 +20,10 @@ func main() {
 	}
 
 	fmt.Println("Welcome to Go Bank!")
+	fmt.Println(randomdata.PhoneNumber())
 
 	for {
-		fmt.Println("What do you want to do?")
+		presentOptions()
-		fmt.Println("1. Check balance")
-		fmt.Println("2. Deposit money")
-		fmt.Println("3. Withdraw money")
-		fmt.Println("4. Exit")
 
 		var choice int
 		fmt.Print("Your choice: ")
@@ -66,7 +44,7 @@ func main() {
 
 			accountBalance += accountBalance
 			fmt.Println("Balance updated! New amount:", accountBalance)
-			writeBalanceToFile(accountBalance)
+			fileops.WriteFloatToFile(accountBalance, accountBalanceFile)
 		case 3:
 			fmt.Print("Your withdrawal")
 			var withdrawalAmount float64
@@ -84,7 +62,7 @@ func main() {
 
 			accountBalance -= withdrawalAmount
 			fmt.Println("Balance updated! New amount:", accountBalance)
-			writeBalanceToFile(accountBalance)
+			fileops.WriteFloatToFile(accountBalance, accountBalanceFile)
 		default:
 			fmt.Println("Goodbye!")
 			fmt.Println("Thanks for choosing our bank")

bank/communication.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func presentOptions() {
+	fmt.Println("What do you want to do?")
+	fmt.Println("1. Check balance")
+	fmt.Println("2. Deposit money")
+	fmt.Println("3. Withdraw money")
+	fmt.Println("4. Exit")
+}

bank/fileops/fileops.go

@@ -0,0 +1,30 @@
+package fileops
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func GetFloatFromFile(fileName string) (float64, error) {
+	data, err := os.ReadFile(fileName)
+
+	if err != nil {
+		return 1000, errors.New("Failed to find file.")
+	}
+	
+	valueText := string(data)
+	value, err :=strconv.ParseFloat(valueText, 64)
+
+	if err != nil {
+		return 1000, errors.New("Failed to parse stored value.")
+	}
+
+	return value, nil
+}
+
+func WriteFloatToFile(value float64, fileName string) {
+	valueText := fmt.Sprint(value)
+	os.WriteFile(fileName, []byte(valueText), 0644)
+}

bank/go.mod

@@ -1,3 +1,5 @@
 module example.com/bank
 
 go 1.23.1
+
+require github.com/Pallinder/go-randomdata v1.2.0 // indirect

bank/go.sum

@@ -0,0 +1,2 @@
+github.com/Pallinder/go-randomdata v1.2.0 h1:DZ41wBchNRb/0GfsePLiSwb0PHZmT67XY00lCDlaYPg=
+github.com/Pallinder/go-randomdata v1.2.0/go.mod h1:yHmJgulpD2Nfrm0cR9tI/+oAgRqCQQixsA8HyRZfV9Y=

go.sum

@@ -0,0 +1,2 @@
+github.com/Pallinder/go-randomdata v1.2.0 h1:DZ41wBchNRb/0GfsePLiSwb0PHZmT67XY00lCDlaYPg=
+github.com/Pallinder/go-randomdata v1.2.0/go.mod h1:yHmJgulpD2Nfrm0cR9tI/+oAgRqCQQixsA8HyRZfV9Y=

pointers/go.mod

@@ -0,0 +1,3 @@
+module example.com/pointers
+
+go 1.23.1

pointers/pointers.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+func main() {
+	age := 32
+
+	var agePointer *int
+	
+	agePointer = &age
+
+	fmt.Println("Age:", *agePointer)
+	
+	editAgeToAdultYears(agePointer)
+	fmt.Println(age)
+}
+
+func editAgeToAdultYears(age *int) {
+	// return *age - 18
+
+	*age = *age - 18
+}