Object Oriented Programming Chapter One Review Quiz

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Questions and Answers

A variable is an untyped name for a location in memory.

False

A variable declaration must specify the variable's name and the type of data it will hold.

True

A variable name can have spaces and is not case sensitive.

False

String name = 'Obama'; is an example of a valid variable declaration in C#.

True Signup and view all the answers

Int age = '30'; is a valid variable declaration in C#.

False Signup and view all the answers

Double price = 15.25; is an example of a valid variable declaration in C#.

True Signup and view all the answers

Boolean dataplan = 1; is a valid variable declaration in C#.

False Signup and view all the answers

Int digit = 10 % 2; will output 2.

False Signup and view all the answers

The basic selection statement is the if-else statement.

False Signup and view all the answers

Which of the following is NOT a valid variable declaration in C#?

Int age = '30'; Signup and view all the answers

What is the role of a variable in programming?

To hold a specific value in memory Signup and view all the answers

Which of the following is NOT a valid variable naming rule in C#?

Can start with a number Signup and view all the answers

What type of information does a 'boolean' variable hold?

True or False values Signup and view all the answers

What would be the output of 'int digit = 10 % 2;' in C#?

0 Signup and view all the answers

In C#, which of the following types represents decimal numbers?

Double Signup and view all the answers

In C#, which construct is used to execute a block of statements depending on a Boolean expression?

if statement Signup and view all the answers

Which type of statement in C# allows for the execution of different blocks of code depending on whether a Boolean expression is true or false?

if-else statement Signup and view all the answers

What is the purpose of the 'else if' part in an if-else statement in C#?

To check for multiple conditions after the initial condition is false Signup and view all the answers

Which logical operator in C# is used to check if two conditions are both true before executing a block of code?

&& Signup and view all the answers

What is the primary purpose of using a foreach loop in C#?

To reduce the risk of indexing error and provide read only access to the elements in the collection Signup and view all the answers

In C#, what type of object can be iterated over using a foreach loop?

Arrays, collections, and enumerable objects Signup and view all the answers

When should a regular for loop be used instead of a foreach loop in C#?

When the elements in the collection need to be modified during iteration Signup and view all the answers

What is the key characteristic of a foreach loop in C#?

It is read-only and does not allow modification of collection elements Signup and view all the answers

Study Notes

Variables in C#

A variable serves as an untyped name pointing to a specific memory location.
Declarations require specifying both the variable's name and the data type it will store.
Variable names can include spaces and are not case sensitive.

Valid Variable Declarations

Example of string declaration: String name = 'Obama';
Example of integer declaration: Int age = '30'; (correctly, Int age = 30;)
Example of double declaration: Double price = 15.25;
Example of boolean declaration: Boolean dataplan = 1; (correctly, Boolean dataplan = true;)
Example of modulus operation: Int digit = 10 % 2; results in 2.

Conditional Statements

The primary conditional statement is the if-else statement.
The 'else if' part allows for additional conditions to be evaluated if the first 'if' statement is false.
A logical operator checks if two conditions are true prior to executing code: the && (AND) operator.

Types of Variables

Boolean variables store truth values, either true or false.
Decimal numbers are represented using the Double type.

Loop Constructs

A foreach loop iterates over objects, executing a block of code for each item in a collection.
A regular for loop should be used when explicit control over iteration is needed (e.g., accessing elements by index).
Key characteristic of a foreach loop: simplifies iteration without needing an index variable.

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Description

Test your knowledge of Object Oriented Programming Chapter One concepts with this quiz. Topics include programming languages, syntax, and encoding instructions for computers.