go go go

bank/balance.txt

@@ -0,0 +1 @@
+1900

bank/bank.go

@@ -1,21 +1,27 @@
 package main
 
+import "errors"
 import "fmt"
 import "os"
 import "strconv"
 
 const accountBalanceFile = "balance.txt"
 
-func getBalanceFromFile() float64 {
+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, _ :=strconv.ParseFloat(balanceText, 64)
-	return balance
+	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) {
@@ -24,7 +30,13 @@ func writeBalanceToFile(balance float64) {
 }
 
 func main() {
-	var accountBalance = getBalanceFromFile()
+	var accountBalance, err = getBalanceFromFile()
+
+	if err != nil {
+		fmt.Println("ERROR")
+		fmt.Println(err)
+		fmt.Println("-------")
+	}
 
 	fmt.Println("Welcome to Go Bank!")