Serial Number: 500 Name: D: Returns 10 and 30 in that order. E: Returns 30 and 30 in that order. Question 19: Consider the following code in Perl: local $x = 10; local $y = 1; sub f { print ("x = $x\n"); if ($y > 0) { 8 (); } sub g { local $x = 20; $y = $y = 1; f (); } f 0)); What will be printed when this program is executed? Recall that Perl uses dynamic scope with variables decla using local. A: x= 10 and x = 20 B: x= 10 and x = 9 C: x= 10 and x = 10 D: x = 10 and x 190 E: x 20 and x = 20
Serial Number: 500 Name: D: Returns 10 and 30 in that order. E: Returns 30 and 30 in that order. Question 19: Consider the following code in Perl: local $x = 10; local $y = 1; sub f { print ("x = $x\n"); if ($y > 0) { 8 (); } sub g { local $x = 20; $y = $y = 1; f (); } f 0)); What will be printed when this program is executed? Recall that Perl uses dynamic scope with variables decla using local. A: x= 10 and x = 20 B: x= 10 and x = 9 C: x= 10 and x = 10 D: x = 10 and x 190 E: x 20 and x = 20
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Scala programming
Transcribed Image Text:**Educational Website Content**
---
**Example Programming Questions and Scenarios**
**Question 19: Consider the following code in Perl:**
```perl
local $x = 10;
local $y = 1;
sub f {
print ("x = $x\n");
if ($y > 0) {
g();
}
}
sub g {
local $x = 20;
$y = $y - 1;
f ();
}
f();
```
What will be printed when this program is executed? Recall that Perl uses dynamic scope with variables declared using `local`.
- A: `x = 10 and x = 20`
- B: `x = 10 and x = 9`
- C: `x = 10 and x = 10`
- D: `x = 10 and x = 190`
- E: `x = 20 and x = 20`
**Answer: C**. The scope of `local` variables in Perl is dynamic, meaning that variables can be accessed and modified by functions called from within that scope.
---
**Question 20: Consider the Scala code:**
```scala
val q = List((x: Int) => x, (x: Int) => x + 1, (x: Int) => x + 2)
q(2)(10)
```
What will happen when `q(2)(10)` is executed?
- A: Returns List (10, 11, 12)
- B: Returns 12
- C: Returns 33
- D: Returns List (12, 12, 12)
- E: Returns 10
**Answer: B**. In Scala, `q(2)(10)` calls the third lambda function in the list with `x` equal to 10, thus returning `12`.
---
**Question 21: Consider the following Java code:**
```java
class A {
static int f(int x) {
return x + 1;
}
}
```
What will be the output of calling the static method `f` with an integer `x`?
---
Note: There are no graphs or diagrams in this content. The provided questions and answers test the reader's understanding of Perl, Scala, and Java programming concepts.
![**Educational Website Transcription**
**Name:**
**Serial Number:** 500
---
### Question 21:
```java
class B extends A {
static int f (int x) {
return x + 2;
}
}
public class Driver {
public static void main (String[] args) {
A o = new B();
System.out.println (o.f (10));
}
}
```
**What will happen when this program is executed?** HINT: "dynamic dispatch" is not used when calling static methods.
A: Prints 11.
B: Fails to compile because B is not a subtype of A.
C: Execution stops with ClassCastException error.
D: Prints 10.
E: Prints 12.
---
### Question 22:
Consider the Scala code:
```scala
val q = List ((x:Int) => x, (x:Int) => x + 1, (x:Int) => x + 2)
```
**What is the type of q?**
A: List[Int=>Int]
B: Int=>List[Int]
C: Int=>Int
D: List[Int]
E: List[(Int,Int,Int)=>Int]
---
### Question 23:
Consider the following Scala code:
```scala
class Counter {
var n = 0
def update () : Unit = { n = n + 1 }
def get () : Int = n
}
class CounterExt extends Counter {
override def update () : Unit = { n = n + 10 }
}
val c1:Counter = new Counter ()
val c2:Counter = new CounterExt ()
c1.update ()
c1.update ()
```
---
This page focuses on providing sample exam questions to help students test their knowledge of Java and Scala programming concepts. For the Java question, understanding inheritance, static methods, and polymorphism is crucial. For the Scala questions, comprehension of lambda expressions, type inference, and class inheritance is essential.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F57e74000-fbe3-481d-ab8d-800d62a3b02c%2Fbe7ef019-70dc-484b-8227-04e77e8cfc1d%2Fk8ceqdc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Educational Website Transcription**
**Name:**
**Serial Number:** 500
---
### Question 21:
```java
class B extends A {
static int f (int x) {
return x + 2;
}
}
public class Driver {
public static void main (String[] args) {
A o = new B();
System.out.println (o.f (10));
}
}
```
**What will happen when this program is executed?** HINT: "dynamic dispatch" is not used when calling static methods.
A: Prints 11.
B: Fails to compile because B is not a subtype of A.
C: Execution stops with ClassCastException error.
D: Prints 10.
E: Prints 12.
---
### Question 22:
Consider the Scala code:
```scala
val q = List ((x:Int) => x, (x:Int) => x + 1, (x:Int) => x + 2)
```
**What is the type of q?**
A: List[Int=>Int]
B: Int=>List[Int]
C: Int=>Int
D: List[Int]
E: List[(Int,Int,Int)=>Int]
---
### Question 23:
Consider the following Scala code:
```scala
class Counter {
var n = 0
def update () : Unit = { n = n + 1 }
def get () : Int = n
}
class CounterExt extends Counter {
override def update () : Unit = { n = n + 10 }
}
val c1:Counter = new Counter ()
val c2:Counter = new CounterExt ()
c1.update ()
c1.update ()
```
---
This page focuses on providing sample exam questions to help students test their knowledge of Java and Scala programming concepts. For the Java question, understanding inheritance, static methods, and polymorphism is crucial. For the Scala questions, comprehension of lambda expressions, type inference, and class inheritance is essential.
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