Assignment 4 Term 4

Quiz (K|C|A)

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

1. What will be shown by the following code fragment

   
   var x = 2 ;
   var y = 2 ;
   if ( x > y ) { 
   	alert("True") ;
   }
   else if ( x != y ) {
   	alert("False") ;
   }
   
   					

   True
   False
   Nothing
   Will print an error message
2. What will be shown by the following code fragment

   
   var x = "Monday" ;
   var y = "Monday" ;
   if ( x == y ) {
   	alert("True") ;
   }
   else if ( x == y ) {
   	alert("False") ;
   }
   
   					

   True
   False
   Nothing
   Will print an error message
3. 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
4. What will be shown by the following code fragment

   	
   	var x = 3 ;
   	if ( x != 2 ) {
   		if ( x > 3) { 
               alert("True") ; 
           }
           else { 
               alert( "There was an error"); 
           }
   	}
       else {
           alert("False");
       }
   	
   						

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

   	
   	x = 13 ; 
   	y = 30 ;
   	if (x > 0){
   	   y = 72;
   	}
   	y = y + 15 ;
   	alert(y) ;
   	
   							

6. Enter the value that will be shown by the following code fragment.

   	
   	x = -23 ;
   	y = 120 ;
   	if (x > 0)}
   	   y = 212 ;
   	}
   	y = y + 52 ;
   	alert(y) ;
   	
   							

7. Enter the value that will be shown by the following code fragment.

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

8. Select the values of x for which the following code will produce the value "yes". There may be more than one correct choice.

   	
   	if ( ! (x < 5) ) {
   	 alert("yes") ;
   	}
   	else {
   	 alert("No") ;
   	}
   	
   							

   3
   5
   10
   50
9. Select the values of y for which the following code will produce the value "No". There may be more than one correct choice.

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

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

    	
    	var name1 = "John" ;
    	var name2 = "Donald" ;
    	var x = 30 ;
    	var person = "unknown"; 
    
    	if ( name1 < name2 ) {
    	 person = name1 ;
    	}
    	else {
    	 person = name2 ;
    	}
    	alert( person ) ;
    	
    							

    John
    Donald
    unknown
    x

Programming in JavaScript

1. Write a program that calculates the following sum: 1+2+2²+2³+2⁴+2⁵+2⁶+2⁷. Also, write as a comment the answer you get. //sum is
2. 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
3. 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.
4. Rewrite the Guess A Number program using loops. Remember, the game gives the user 3 chances to guess that hidden number. Hint: Use a while-loop.