Methods and Decision-Making in Programming

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What will be the output of the main method in the Test class?

Error: makeSound method not found

No output

Bark (correct)

Some generic sound

Which statement is true about the array search implemented in the provided code?

It checks for null values before searching

It returns the first occurrence of the key found, or -1 if not found (correct)

It sorts the array before searching for the key

It uses binary search to find the key efficiently

What condition causes a swap during the bubble sort process?

If arr[j] is less than arr[j + 1]

If arr[j] is not found in the array

If arr[j] is greater than arr[j + 1] (correct)

If arr[j] is equal to arr[j + 1]

How does a nested loop behave within another nested loop?

The outer loop runs completely for every iteration of the inner loop. Signup and view all the answers

Which of the following is an accurate characteristic of arrays as described?

Arrays are indexed starting from zero. Signup and view all the answers

What is a primary benefit of using methods in code?

They enable reusability and easier management. Signup and view all the answers

What does the method `isEven(int num)` return when `num` is equal to 7?

false Signup and view all the answers

In the leap year checking condition, which of the following statements must be true for a year to be classified as a leap year?

It must be divisible by 4 but not by 100, or divisible by 400. Signup and view all the answers

What does the calculateArea method return when called with length 5 and width 10?

50 Signup and view all the answers

Which statement correctly identifies how the switch statement is utilized to check if a character is a vowel?

It checks the character against multiple cases in a single condition. Signup and view all the answers

What is the role of inheritance in object-oriented programming?

It enables one class to inherit properties and methods of another. Signup and view all the answers

What is the output of the `if` statement for the year 1900 when checking for a leap year?

Not a leap year Signup and view all the answers

What operation is performed by the modulus operator % in the method `isEven(int num)`?

It determines the remainder of division by 2. Signup and view all the answers

Study Notes

Methods

A method is a block of code performing a specific task.
Methods make code reusable and manageable.
Methods can accept parameters and/or return values.

Exercise 1 (Methods) - Finding Maximum of Three Integers

findMax(int a, int b, int c) method finds the largest of three integers.
It uses if-else if statements to compare the integers.
The method returns the largest integer.

Exercise 2 (Methods) - Checking Even Numbers

isEven(int num) method checks if a number is even.
It uses the modulus operator (%) to see if the number is divisible by 2.
Returns true if even, false otherwise.

Exercise 3 (Methods) - Calculating Rectangle Area

calculateArea(int length, int width) method calculates the area of a rectangle.
It multiplies length and width to get the area.
The method returns the calculated area.

Decision-Making Statements

Decision-making statements (like if-else, switch) allow programs to make choices based on conditions.

Exercise 1 (Decision-Making) - Leap Year Check

Checks if a year is a leap year.
A year is a leap year if:
- Divisible by 4 but not by 100.
- Or divisible by 400.

Exercise 5 (Decision-Making) - Vowel/Consonant Check

Checks if a character is a vowel or a consonant.
Uses a switch statement to check multiple cases (vowels).
Prints "Vowel" for vowels and "Consonant" otherwise.

Inheritance

Inheritance lets one class (subclass) acquire properties and methods of another class (superclass).
The parent class contains common features; subclasses add specifics.

Exercise 1 (Inheritance) - Animal and Dog Example

Animal class has a makeSound() method (generic sound).
Dog class inherits from Animal and overrides makeSound() to produce "Bark."

Arrays

An array stores elements of the same type in contiguous memory locations.
Arrays are indexed from 0.

Exercise 2 (Arrays) - Searching an Array

search(int[] arr, int key) method searches for a key within an array.
It iterates through the array.
Returns the index of the key if found; otherwise, returns -1.

Exercise 4 (Arrays) - Bubble Sort

bubbleSort(int[] arr) method sorts an array using bubble sort.
Compares adjacent elements and swaps them if the left is greater than the right.
Repeats until the array is sorted.

Nested Loops

Nested loops allow iteration over multiple dimensions or repeated patterns.
The inner loop completes for each iteration of the outer loop.

Exercise 3 (Nested Loops) - Pyramid Pattern

Generates a pyramid pattern using nested loops.
The pattern's structure is formed by controlling spaces and asterisks in each row.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz covers methods in programming, focusing on tasks such as finding the maximum of three integers, checking even numbers, and calculating the area of a rectangle. Additionally, it discusses decision-making statements that enable programs to make choices based on conditions. Test your understanding of these fundamental concepts in programming.