refactoring: made code more readable and enhanced the menuInput() and chooseOption() functions.

src/CustomerData.txt

@@ -4,5 +4,3 @@ forename=Max
 Surname=Mustermann
 password=example
 balance=0
-
-

src/mainMenu.c

@@ -25,16 +25,7 @@ bool checkIfInteger(char* userInput)
 bool chooseOption(int choiceInput)
 {
 
-    if(choiceInput<1 || choiceInput>4)
-    {
-        return false;
-    }
-
-    else
-    {
-
-        return true;
-    }
+    return !(choiceInput < 1 || choiceInput > 4);
 
 }
 
@@ -55,21 +46,17 @@ void ageInput()
 
     while (true)
     {
+	    /*the userInput string is changed to a number with the strtol function*/
+
 	    age = strtol(userInput,&userInputPointer,10);
 
         if((checkIfInteger(userInput))&& (agePermission(age)))
 	    {
 
 	        printf("Access granted!\n\n\n\n");
-
 	        showMenu();
-             
-            menuInput();
-
             menuInput();
-
 	        break;
-
     	}
 
 	    else if((checkIfInteger(userInput)) && !(agePermission(age))) 
@@ -85,117 +72,55 @@ void ageInput()
 	    {
 	        printf("input invalid! try again!\n");
             scanf("%s",userInput);
+            int c;
+            /*this loop flushes the input buffer for the upcoming getchar*/
+            while ((c = getchar()) != '\n' && c != EOF) {};
 
 	    }
     
     }
 
 }
+
 void menuInput()
 {
-
     char choiceInput[20];
-
     char* choiceInputPointer;
-
     int selection;
     
     scanf("%s", choiceInput);
-    
-    while(true)
-    {
+     int c;
+    /*this loop flushes the input buffer for the upcoming getchar*/
+    while ((c = getchar()) != '\n' && c != EOF) {};
     selection = strtol(choiceInput, &choiceInputPointer, 10);
     
-        if(chooseOption(selection) == true && checkIfInteger(choiceInput) == true)
-	{
-            switch(selection)
-	    {
-
-                case 1 : printf("\nLoginAsCostumer() function will be implemented here soon\n\n");
-
-                         break;
-
-                case 2 : printf("\ncreateCostumerAccount() function will be implemented here soon\n\n");
-
-                         break;
-
-                case 3 : printf("\nLoginAsEmployee() function will be implemented here soon\n\n");
-
-                         break;
-
-                case 4 : printf("\e[1;1H\e[2J");
-
-			 printf("\nsee you next time !\n\n");
-
-                         break;
-                
-             }
-	    break;
-        }
-
-        else
+    while (!checkIfInteger(choiceInput) || !chooseOption(selection)) 
     {
         printf("Input invalid! try again!\n");
 
         scanf("%s", choiceInput);
-        }
-    }
-
-}
-
-void menuInput()
-{
-
-    char choiceInput[20];
-
-    char* choiceInputPointer;
-
-    int selection;
-    
-    int c;
-    scanf("%s",choiceInput);
-    /*this loop flushes the input buffer for the upcoming getchar*/
         while ((c = getchar()) != '\n' && c != EOF) {};
 
-    while(true)
-    {
         selection = strtol(choiceInput, &choiceInputPointer, 10);
+    }
     
-        if(chooseOption(selection) == true && checkIfInteger(choiceInput) == true)
-	{
     switch(selection) 
     {
-
         case 1 : printf("\nLoginAsCostumer() function will be implemented here soon\n\n");
-
                  break;
 
         case 2 : collectCustomerProperties();
                  break;
 
         case 3 : printf("\nLoginAsEmployee() function will be implemented here soon\n\n"); 
-
                  break;
 
         case 4 : printf("\e[1;1H\e[2J"); 
-
                  printf("\nsee you next time !\n\n"); 
-
                  break;
-                
     }     	
-	    break;
 }
 
-        else
-        {
-            printf("Input invalid! try again!\n");
-
-	    scanf("%s",choiceInput);
-        }
-    }
-
-}
 
 void showMenu()
 {