refactoring getAvailableBalance

src/sendmoney.c

@@ -3,10 +3,35 @@ int main()
 {
     SendMoney();
 }
-double getAvailableAccountBalance(double balance)
+double getAvailableAccountBalance(int length)
 {
+    double availableBalance;
 
-       return balance;
+    FILE *fp;
+    fp = fopen("CustomerData.txt", "r");
+
+    if (fp == 0)
+    {
+        printf("Error: customer data file cannot be opened!\n");
+        return 0;
+    }
+    else
+    {
+
+        char line[length];
+
+        while (fgets(line, sizeof line, fp) != NULL)
+        {
+            if (sscanf(line, "balance=%lf", &availableBalance) == 1)
+            {
+                break;
+            }
+        }
+        fclose(fp);
+        printf("your balance is : %lf\n", availableBalance);
+    }
+
+    return availableBalance;
 }
 
 // hier wird geprüft ob das Kontonummer gultig ist
@@ -48,7 +73,7 @@ void getReceiverAccountNumber()
 
     else
     {
-        printf("Kontonummer ist Gueltig");
+        printf("Kontonummer ist Gueltig\n");
     }
 }
 
@@ -65,8 +90,6 @@ void SendMoney()
     int receiverAccountNumber;
     double availableAccountBalance = getAvailableAccountBalance(length);
 
-    printf("%lf", availableAccountBalance);
-
     char tryDifferentAmount;
 
     if (amountToSend < 0)

src/sendmoney.h

@@ -6,7 +6,7 @@
 #include <string.h>
 
 bool checkAccount(int accountNumber);
-double getAvailableAccountBalance(double balance);
+double getAvailableAccountBalance(int length);
 
 double getAmount(double amountToSend);
 void getReceiverAccountNumber();