From 83dba7282afa2f97045f32d780ff68dc154f89d4 Mon Sep 17 00:00:00 2001
From: Martin Schmollinger <martin.schmollinger@reutlingen-university.de>
Date: Fri, 7 Apr 2023 19:02:01 +0200
Subject: [PATCH] Solution to exercise of unit 04-03
---
exercise_0403/go.mod | 3 +++
exercise_0403/main.go | 53 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)
create mode 100644 exercise_0403/go.mod
create mode 100644 exercise_0403/main.go
diff --git a/exercise_0403/go.mod b/exercise_0403/go.mod
new file mode 100644
index 0000000..e4b477a
--- /dev/null
+++ b/exercise_0403/go.mod
@@ -0,0 +1,3 @@
+module gitlab.reutlingen-university.de/go-exercises/go-starter/exercise_0403
+
+go 1.20
diff --git a/exercise_0403/main.go b/exercise_0403/main.go
new file mode 100644
index 0000000..5d9f214
--- /dev/null
+++ b/exercise_0403/main.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+ "fmt"
+)
+
+type BankAccount struct {
+ balance float32
+ limit float32
+}
+
+func (ba *BankAccount) Withdraw(amount float32) error {
+
+ if amount > ba.balance+ba.limit {
+ err := BankAccountWithdrawalError{
+ Amount: amount,
+ Balance: ba.balance,
+ Limit: ba.limit,
+ Msg: "amount currently not available",
+ }
+ return err
+ } else {
+ ba.balance -= amount
+ return nil
+ }
+}
+
+type BankAccountWithdrawalError struct {
+ Amount float32
+ Balance float32
+ Limit float32
+ Msg string
+}
+
+func (e BankAccountWithdrawalError) Error() string {
+ return fmt.Sprintf("%s: %f > %f", e.Msg, e.Amount, e.Balance+e.Limit)
+}
+
+func main() {
+ ba := BankAccount{
+ balance: 1000.0,
+ limit: 3000.0,
+ }
+ fmt.Printf("%v\n", ba)
+ if err := ba.Withdraw(5000); err != nil {
+ fmt.Printf("%s\n", err.Error())
+ }
+ fmt.Printf("%v\n", ba)
+ if err := ba.Withdraw(1000); err != nil {
+ fmt.Printf("%s\n", err.Error())
+ }
+ fmt.Printf("%v\n", ba)
+}
--
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