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programming languages Online Quiz - 175

Description: programming languages Online Quiz - 175
Number of Questions: 20
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Tags: programming languages
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The keyword __________ is required to declare a class.
technology programming languages

  1. public

  2. private

  3. class

  4. All of the above.

Show answer
Correct Option: C

class TempClass { int i; public void TempClass(int j) { int i = j; } } public class C { public static void main(String[] args) { TempClass temp = new TempClass(2); } }
technology programming languages

  1. The program has a compilation error because TempClass does not have a default constructor.

  2. The program has a compilation error because TempClass does not have a constructor with an int argument.

  3. The program compiles fine, but it does not run because class C is not public.

  4. The program compiles and runs fine.

Show answer
Correct Option: B

Given the declaration Circle x = new Circle(), which of the following statement is most accurate.
technology programming languages

  1. x contains an int value

  2. x contains an object of the Circle type.

  3. x contains a reference to a Circle object.

  4. You can assign an int value to x.

Show answer
Correct Option: C
Explanation:

To understand this question, the user needs to have basic knowledge of object-oriented programming and class declaration. In the given declaration Circle x = new Circle(), we are creating an object of the Circle class.

Now let's go through each option to determine the correct answer:

A. x contains an int value: This statement is incorrect because the Circle class does not contain int values. Therefore, x cannot contain an int value.

B. x contains an object of the Circle type: This statement is correct. The code is creating an object of the Circle class and assigning it to the variable x. Therefore, x contains an object of the Circle type.

C. x contains a reference to a Circle object: This statement is correct. In Java, objects are created on the heap and accessed through references. When we create an object of a class, we are creating an instance of that class on the heap and assigning a reference to that instance to a variable.

D. You can assign an int value to x: This statement is incorrect because x is declared as an object of the Circle class, not as an int. Therefore, you cannot assign an int value to x.

The correct answer is: C. x contains a reference to a Circle object.

Analyze the following code. public class Test { int x; public Test(String t) { System.out.println("Test"); } public static void main(String[] args) { Test test = null; System.out.println(test.x); } }
technology programming languages

  1. The program has a syntax error because test is not initialized.

  2. The program has a syntax error because x has not been initialized.

  3. The program has a syntax error because you cannot create an object from the class that defines the object.

  4. The program has a syntax error because Test does not have a default constructor.

  5. The program has a runtime NullPointerException because test is null while executing test.x.

Show answer
Correct Option: E

The default value for data field of a boolean type, numeric type, object type is ___________, respectively.

technology programming languages

  1. true, 1, Null

  2. false, 0, null

  3. true, 0, null

  4. true, 1, null

Show answer
Correct Option: B

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) true, 1, Null - This option is incorrect because the default value for a boolean type is false, not true. Also, the default value for a numeric type is 0, not 1. Lastly, the default value for an object type is null, not Null.

Option B) false, 0, null - This option is correct. The default value for a boolean type is false, the default value for a numeric type is 0, and the default value for an object type is null.

Option C) true, 0, null - This option is incorrect because the default value for a boolean type is false, not true. Also, the default value for a numeric type is 0, not 1. Lastly, the default value for an object type is null, not Null.

Option D) true, 1, null - This option is incorrect because the default value for a boolean type is false, not true. Also, the default value for a numeric type is 0, not 1. Lastly, the default value for an object type is null, not null.

The correct answer is B. This option is correct because the default value for a boolean type is false, the default value for a numeric type is 0, and the default value for an object type is null.

Analyze the following code: public class Test { public static void main(String[] args) { double radius; final double PI= 3.15169; double area = radius * radius * PI; System.out.println("Area is " + area); } }

technology programming languages

  1. The program has syntax errors because the variable radius is not initialized.

  2. The program has a syntax error because a constant PI is defined inside a method.

  3. The program has no syntax errors but will get a runtime error because radius is not initialized.

  4. The program compiles and runs fine

Show answer
Correct Option: A
Explanation:

To analyze the given code, we can see that it calculates the area of a circle using a radius and a constant value of PI.

Now let's go through each option and explain why it is right or wrong:

A. The program has syntax errors because the variable radius is not initialized.

This option is partially correct. The variable radius is indeed declared but not initialized. Java requires variables to be initialized before they can be used in calculations. Therefore, the program will not compile due to this syntax error.

B. The program has a syntax error because a constant PI is defined inside a method.

This option is also partially correct. The constant PI is indeed defined inside the main method. However, this is not a syntax error. It is a common practice to define constants inside methods in Java. Therefore, this option is incorrect.

C. The program has no syntax errors but will get a runtime error because radius is not initialized.

This option is incorrect. The program has a syntax error because the variable radius is not initialized. Therefore, the program will not run at all, let alone produce a runtime error.

D. The program compiles and runs fine.

This option is incorrect because the program has a syntax error. It will not compile due to the uninitialized variable radius.

Therefore, the correct answer is:

The Answer is: A

Analyze the following code. public class Test { int x; public Test(String t) { System.out.println("Test"); } public static void main(String[] args) { Test test = new Test(); System.out.println(test.x); } }
technology programming languages

  1. The program has a syntax error because System.out.println method cannot be invoked from the constructor.

  2. The program has a syntax error because x has not been initialized.

  3. The program has a syntax error because you cannot create an object from the class that defines the object.

  4. The program has a syntax error because Test does not have a default constructor.

Show answer
Correct Option: D

Variables that are shared by every instances of a class are __________.
technology programming languages

  1. public variables

  2. private variables

  3. instance variables

  4. class variables

Show answer
Correct Option: D

You should add the static keyword in the place of ? in Line ________ in the following code: 

  1 public class Test {   2 private int age;  3   4 public ? int square(int n) {   5 return n * n;  6 }  7  8 public ? int getAge() {  9 }  10}

technology programming languages

  1. in line 4

  2. in line 8

  3. in both line 4 and line 8

  4. none

Show answer
Correct Option: A

SAS programming language is a
technology programming languages

  1. 3rd generation programming language

  2. 4th generation programming language

  3. 5th generation programming language

  4. All of the above

Show answer
Correct Option: B

SAS was conceived by
technology programming languages

  1. Anthony J. Barr

  2. James Goodnight

  3. John Sall

  4. Caroll G. Perkins

Show answer
Correct Option: A

Which of the following is not a SAS components
technology programming languages

  1. Base SAS

  2. SAS Enterprise Business Intelligence Server

  3. SAS/ACCESS

  4. SAS Toolware Studio Administrator

Show answer
Correct Option: D

First limited release of the SAS system

technology programming languages

  1. SAS 60

  2. SAS 71

  3. SAS 10.0

  4. SAS 1S

Show answer
Correct Option: B

Which Component of SAS provides the ability to transparently share data with non-native datasources

technology programming languages

  1. Enterprise Miner

  2. SAS/ACCESS

  3. SAS/SCL

  4. SAS/CONNECT

Show answer
Correct Option: B

SAS had been criticized for its poor graphics, In which version the graphics improved significantly.

technology programming languages

  1. SAS 6

  2. SAS 7

  3. SAS 8

  4. SAS 9

Show answer
Correct Option: B

Location of SAS's Worldwide Headquarters
technology programming languages

  1. Cary,NC,USA

  2. Churchgate,Mumbai,India

  3. Ontario,Canada

  4. NYC,New York,USA

Show answer
Correct Option: A

SAS Institute has its own book publishing arm, known as SAS Press.True or False.

technology programming languages

  1. True

  2. False

Show answer
Correct Option: B

The goal of this product is to compete with Business Objects and Cognos' offerings.

technology programming languages

  1. OLAP Cube Studio

  2. SAS/CONNECT

  3. Enterprise Guide

  4. SAS Enterprise Business Intelligence Server

Show answer
Correct Option: D

What is SAS/SCL?

technology programming languages

  1. Allows SAS to transparently share data with personal computer applications including MS Access and Microsoft Office Excel

  2. A plugin for Information Delivery Portal. It allows the user to create various graphics that represent a broad range of data. This allows a quick glance to provide a lot of information, without having to look at all the underlying data.

  3. Allows programmers to create and compile object-oriented programs.

  4. A client application that helps with building information maps.

Show answer
Correct Option: C

Which of the following is not a group function?
technology programming languages

  1. avg( )

  2. sqrt( )

  3. sum()

  4. max()

Show answer
Correct Option: D
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