This test consists in two parts: a quiz with questions and a coding part with 4 problems. All, questions and problems, weigh the same towards the final mark.

Class notes, W3Schools site, calculators and phone apps can be used. For questions involving JavaScript you should check your answers using the HTML live editor.

Alloted time: 1h

Quiz (K|C|A)

Write your answer in the corresponding textboxes or choose the rigth radio buttons/checkboxes.

1. Write a webpage with the following requirements
   • The title must be "Exam"
   • The body contains 3 headings:
     1. The largest possible goes at the top and says "G9 Exam 2019"
     2. The second heading is a bit smaller than the first and says "Text"
     3. The last heading is as large as the second and says "Media"
   • Under the first heading write 2 paragraphs:
     • The first says: "This is paragraph 1" and the word paragraph is in boldface
     • The second says: "This is a second paragraph" and the word second is emphasized, i.e., is in italics
   • Under the media heading do the following:
     • Write a text that says "G9 CS slides" and make it a link pointing to the URL http://msantos.sdf.org/G9
     • Insert the picture with URL http://msantos.sdf.org/G9/MZ.png
2. Determine if the following Turing machine will halt or not. You can use the online simulator. It starts in state I reading the first character on the left of a tape with content "1001001". The rules are below. Finally, write here the output of this Turing machine. Rules:

   						
    1.- ( I , 0 ) -> ( 1, ->, I )                              2.- ( I , #) -> (#, <-, I ) 
    3.- ( I , 1 ) -> ( 1, <-, A)                               4.- (A, 0) -> ( 1, ->, A)
    5.- (A, 1 ) -> ( 1, <-, A)                                 6.- (A, #) -> (#, ->, E)
    7.- (E, * ) -> HALT 
   						
   					

3. Write the name of the following gate and write down its truth table. Label the input lines x and y and the output line z.
4. Write the name of the following gate and write down its truth table. Label the input lines x and y and the output line z.
5. Write the name of the following gate and write down its truth table. Label the input lines x and y and the output line z.
6. b=10110010 is a number wriiten in bynary and d=254 is one written in decimal notation. If we write b in decimal and d in binary, which of the following is true?
   b=178 and d=11110111
   b=175 and d=11111110
   b=178 and d=11111110
   b=175 and d=11110111
7. What will be shown by the following code fragment

   					
   						var x = 2 ;
   						if ( x != 2 ) {
   							alert("True") ;
   						}
   					
   					

   True
   False
   Nothing
   Will print an error message
8. Enter the value that will be shown by the following code fragment.

   
   x = 3 ; 
   y = 10 ;
   if (x > 0){
      y = 12;
   } else if ( x > 1) {
      y = y + 5 ;
   } else {
      y = 7 ;
   }
   alert(y) ;
   
   						

9. Select the values of x for which the following code will produce the value "No". There may be more than one correct choice.

   
   							if ( x > 5 || x < 90) {
   							 alert( "yes") ;
   							}
   							else {
   							 alert("No") ;
   							}
   						
   						

   3
   5
   10
   100
10. what name will this code show?

    
    var name1 = "John" ;
    var name2 = "Donald" ;
    var person = "unknown"; 
    
    if ( (name2 + 'Trump') < name1 ) {
     person = name1 ;
    }
    else {
     person = name2 ;
    }
    alert( person ) ;
    
    						

    John
    Donald
    unknown
    x
11. The following is a code in JavaScript. It asks the user for 2 numbers. Assume the user answers 7 to the first prompt and 3 to the second. Write the full message of the alert pop-up window that the user will get.

    
    x = Number( prompt("Enter a number") )
    y = Number( prompt("Enter a second number") )
    alert( "The sum of "+x+" and "+y+" is "+x+y )
    
    						

12. How many times will this loop print the text "Hello World"?

    
    var i = 2
    while ( i < 10 ){
      print("Hello World")
      i = i + 2
    }
    
    						

    8
    10
    None
    4
    Infinite

Programming in JavaScript

1. Write a program that asks the user for a number. Assign that number to the variable x. Then show an alert with the message Your number + 137 is equal to ____, where the blank space must contain the sum of 137 plus the number introduced by the user.
2. Write a loop that repeats 3 times. In each iteration it must print the text "Iteration ____" where the blank space must be the iteration number starting by 1 for the first iteration.
3. Write a program that asks the user for a number, it assigns it to a variable called N, and then calculates the following sum: 1+2+3+...+N. Also, write as a comment the answer you get when the user inputs 137. //sum is
4. Write a program that calculates the following sum: 0 + 2⁰+ 2*2¹+ 3*2²+ 4*2³+ 5*2⁴+ 6*2⁵. Also, write as a comment the answer you get. //sum is
5. Write a program that calculates the following product: 1*2*1/3*4*1/5*6*1/7*...*1/19*20. Also, write as a comment the answer you get. Notice: You must use only one while-loop. Yet there are different ways to solve this problem. //product is
6. Somebody scrambled our code. Reorder the different lines of code shown here so that you end up with a program that shows in order the following messages: "Happy birthday to you" (twice), "Happy birthday dear Julia", "Happy birthday to you". Notice: You cannot remove anything and all text below must be used in the final program } alert("Happy birthday dear Julia") ; for(var i=1 ; i<=2 ; i=i+1){ alert("Happy birthday to you") ; alert("Happy birthday to you") ;
7. Write a program that prompts the user to guess a number. If it is correct, show a dialog window with the message "Correct!". If the guess is not right, show a dialog box with the message "Sorry. Incorrect guess.". You have to choose the hidden number yourself.
8. Write a program that prompts the user to guess a number. This time we will give the user 3 posibilities to guess it right. At any time, if the guess is correct, show a dialog window saying so. If a guess is larger than the hidden number the program must show a dialog box saying "It's smaller!"; if a guess is smaller than the right number, the program must print "It's larger!". If after the third try the guess is not right, show a dialog box with the message "Game over.". You have to choose the hidden number yourself.