Strings and GUI Quiz Practice

1. Describe one clear advantage of writing a GUI program rather
   than programming in text-mode.
     
2. Explain how you can use a method(s) to make a program simpler.
     
3. Outline the purpose of the actions method in an EasyApp program.
     
4. Write a single command to input the price of a lunch.
   Assume you are using EasyApp.
     
5. Write the correct .substring command so that the following prints "ates":
     String info = "Mr Gates is rich";
     String name = info.substring(____ , ____);
     output(name);
       
6. Write a short set of commands that input a user's password,
   and then check whether the user typed "secret" (the correct password).
   It should print either "correct" or "wrong".
    
7. Explain why the following is incorrect:
     if (name == "Bob")
     {  output("Hi, Fred"); }
      
8. Write a method that asks the user to type in their nationality AND age.
   The method should print "You can drive"  in the following circumstances:
           USA  ,  over 15
           Germany , over 18
           Japan  ,  over 21
   Any other inputs cause the method to print "You CANNOT drive".

You may use any notes you wish, including web-sites, as well as using a computer.
You may write all your answers on the test page.

(9)  State exactly what the output commands below will display:

String info = "Magic tricks";

int size = info.length();

char letter = info.charAt(2);

String word = info.substring(6,9);

int p = info.indexOf("tricks");

output(word);                    ___________________________

output(size);                    ___________________________

output(letter);                  ___________________________

output(p);                       ___________________________

(10)  The following commands should input an e-mail address,
       and then decide whether it "looks right" by checking that:
          i.  there cannot be any blank spaces in the String
         ii.  the character "@" must be in the String
      Fill in the blanks to make it work correctly

____________  email = input("Type your email address");

_____________  pos = email.indexOf(" ");

if ( ___________________ ) 
{  output("No good - blank spaces are not permitted."); }

____________  atsign = email.________________( _______________ ) ;

if ( ________________ )
{  output("No good - there must be an @ sign somewhere."); }

//--------------------------------------------------------------------

Now add more commands to check that there is a period (dot) somewhere in the email address AFTER the "@" sign.  For example:

              "joe@fis"  is not okay
              "joe.smith@fis" is not okay
              "Joe@fis.edu" is okay.

Continue your answer on the back of the page.