programming languages Online Quiz - 8

Question 1 Multiple Choice (Single Answer)

What is the output of the below JavaScript?

<script>  		
var bol = new Boolean();  		
alert(bol);  	
</script>

false
true
error
None of the above

Question 2 Multiple Choice (Single Answer)

What is the output of the below JavaScript?

<script>  		
var patt1 = new RegExp("e");  		
alert(patt1.test("This is an example"));  	
</script>

false
true
e
11

Question 3 Multiple Choice (Single Answer)

<script>  		
var patt1 = new RegExp(/e/g);
 alert(patt1.exec("This is an Example"));  	
</script>

e
E
error
16

Question 4 Multiple Choice (Single Answer)

<script>  		
var str = "This is an Example";
  alert(str.match("example"));  	
</script>

null
Example
example
error

Question 5 Multiple Choice (Single Answer)

<script>  		
var str = "This is an Example"; 
 alert(str.search("example"));  	
</script>

11
-1
error
Example

Question 6 Multiple Choice (Single Answer)

<script>
  	var str = "This is an Example";
  	alert(str.replace("Example", "Error"));  	
</script>

Example
Error
This is an Example
This is an Error

Question 7 Multiple Choice (Single Answer)

<script>  		
var one = ["a", "b"];  		
var two = ["c", "d"];  		
var three = one.concat(two);  		alert(three);	  	
</script>

abcd
a,b,c,d
c,d,a,b
error

Question 8 Multiple Choice (Single Answer)

<script>  		
var one = ["a", "b"];
alert(one.join("&&"));	  	
</script>

a&&b
ab&&
a,b,&&
error

Question 9 Multiple Choice (Single Answer)

<script>  		
var one = ["a", "b", "c"];  		
one.pop();  		
alert(one);	  	
</script>

a,b
b,c
error
a,b,c

Question 10 Multiple Choice (Single Answer)

What is the output of the below JavaScript?

<script>  		
var one = ["a", "b", "c", "d"];  		
alert(one.slice(-2));	  	
</script>

error
a,b
a,b,c,d
c,d

Question 11 Multiple Choice (Single Answer)

Given:

public static void before() {
    Set set = new TreeSet();
    set.add("2");
    set.add(3);
    set.add("1");
    Iterator it = set.iterator();
    while (it.hasNext())    System.out.print(it.next() + " ");
}

Which statements are true?

The before() method will print 1 2
The before() method will print 1 2 3
The before() method will print three numbers, but the order cannot be determined
The before() method will not compile
The before() method will throw exception at runtime

Question 12 Multiple Choice (Single Answer)

Given:


import java.util.*;   
public class Magellan {   
  public static void main(String[] args) {   
    TreeMap<String, String> myMap = new TreeMap<String, String>();   
    myMap.put("a", "apple"); myMap.put("d", "date");   
    myMap.put("f", "fig"); myMap.put("p", "pear");   
    System.out.println("1st after mango: " +   // sop 1  
       myMap.higherKey("f"));  
     System.out.println("1st after mango: " +   // sop 2  
       myMap.ceilingKey("f"));  
     System.out.println("1st after mango: " +   // sop 3  
       myMap.floorKey("f"));  
     SortedMap<String, String> sub = new TreeMap<String, String>();  
     sub = myMap.tailMap("f");  
     System.out.println("1st after mango: " +   // sop 4  
       sub.firstKey());  
   }  
 }

Which of the System.out.println statements will produce the output 1st after mango: p?

sop 1
sop 2
sop 3
sop 4
compilation fails

To solve this question, we need to understand the methods used in the given Java code. TreeMap is a class that implements the Map interface using a tree structure. It stores key-value pairs in a sorted order. The methods used in the given code are:

higherKey(Object key): Returns the least key strictly greater than the given key, or null if there is no such key.
ceilingKey(Object key): Returns the least key greater than or equal to the given key, or null if there is no such key.
floorKey(Object key): Returns the greatest key less than or equal to the given key, or null if there is no such key.
tailMap(K fromKey): Returns a view of the portion of this map whose keys are greater than or equal to fromKey.

Now, let's go through each option and determine which one will produce the output "1st after mango: p":

A. sop 1: This statement calls the higherKey() method on the TreeMap object with the argument "f". This returns the least key strictly greater than "f", which is "p". The output of this statement will be "1st after mango: p". Therefore, option A is correct.

B. sop 2: This statement calls the ceilingKey() method on the TreeMap object with the argument "f". This returns the least key greater than or equal to "f", which is "f" itself. The output of this statement will be "1st after mango: f". Therefore, option B is incorrect.

C. sop 3: This statement calls the floorKey() method on the TreeMap object with the argument "f". This returns the greatest key less than or equal to "f", which is "f" itself. The output of this statement will be "1st after mango: f". Therefore, option C is incorrect.

D. sop 4: This statement creates a new TreeMap object named sub using the tailMap() method on the existing TreeMap object myMap. The tailMap() method returns a view of the portion of this map whose keys are greater than or equal to "f". The sub.firstKey() method returns the first key in the sub map, which is "f". The output of this statement will be "1st after mango: f". Therefore, option D is incorrect.

E. compilation fails: There are no compilation errors in the given code. Therefore, option E is incorrect.

The Answer is: A. sop 1

Question 13 Multiple Choice (Multiple Answers)

Given:

class TKO {
    public static void main(String[] args) {
        String s = "-";
        Integer x = 343;
        long L343 = 343L;
        if(x.equals(L343))  s += ".e1 ";
        if(x.equals(343))  s += ".e2 ";
        Short s1 = (short)((new Short((short)343)) / (new Short((short)49)));
        if(s1 == 7)        s += "=s ";
        if(s1 < new Integer(7+1))  s += "fly ";
        System.out.println(s);
    }
}

Which of the following will be included in the output String s? (Choose all that apply.)

.e1
.e2
=s
fly

Question 14 Multiple Choice (Single Answer)

Given:

import java.util.regex.*;   
public class Archie {   
  public static void main(String[] args) {   
    Pattern p = Pattern.compile(args[0]);   
    Matcher m = p.matcher(args[1]);   
    int count = 
  
    while(m.find())  
       count++;  
     System.out.print(count);  
   }  
 }

And given the command line invocation:
java Archie "\d+" ab2c4d67
What is the result?

0
3
4
8
9

Question 15 Multiple Choice (Single Answer)

Given:

import java.util.*;   
public class Looking {   
  public static void main(String[] args) {   
    String input = "1 2 a 3 45 6";   
    Scanner sc = new Scanner(input);   
    int x = 0;   
    do {  
       x = sc.nextInt();  
       System.out.print(x + " ");  
     } while (x!=0);  
   }  
 }

What is the result?

1 2
1 2 3 45 6
1 2 3 4 5 6
1 2 a 3 45 6
1 2 followed by an exception

Question 16 Multiple Choice (Single Answer)

SAS stands for

Statistical Analysis System
Statistical Analysis Systems
Statistic Analysis System
Statestical Analysis System

Question 17 Multiple Choice (Single Answer)

SAS is a

Low Level Language
High Level Language
Machine Level Language
Binary Level Language

Question 18 Multiple Choice (Single Answer)

SAS is a

Sixth Generation Language
Third Generation Language
Fifth Generation Language
Fourth Generation Language

Question 19 Multiple Choice (Single Answer)

SAS can be used to

Data access
Data management
Data analysis
All the above

Question 20 True/False

SAS can't be used for "Data Presentation"

True
False

programming languages Online Quiz - 8

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