Understanding Output in Java: A Look at CSE110 Code Snippets

What is the output of the following code snippet? public static void main(String[] args) { int num1 = 10; int num2 = 5; int num3 = 200; num3 = num3 % (num1 * num2); System.out.println(num3); }

• A. 0
• B. 4
• C. 10
• D. 250

Answer: (A)

To determine the output of the code snippet, let's analyze the operations step-by-step. The code defines three integer variables: `num1`, `num2`, and `num3` with values 10, 5, and 200, respectively. The critical operation happening in the code is the calculation of `num3` using the modulus operator (`%`). The expression `num3 = num3 % (num1 * num2);` calculates the modulus of `num3` with the product of `num1` and `num2`. First, we need to compute the multiplication: - `num1 * num2` is equal to `10 * 5`, which results in `50`. Next, we perform the modulus operation: - `num3 % 50` calculates the remainder when `num3` (which is 200) is divided by 50. When 200 is divided by 50, it goes evenly 4 times, with no remainder, resulting in a remainder of 0. Therefore, after this operation, `num3` is assigned the value of `0`. Finally, the code prints the value of `num3`, which has now been updated to `0`, leading to the

Hey there, aspiring programmers! If you’re gearing up for the CSE110 at Arizona State University, you might’ve stumbled upon code snippets that make you scratch your head—or shake it in confusion. Today we're diving into one of those snippets to unveil its secrets, focusing on an interesting aspect: the modulus operation. Ready to unlock some programming insights? Let’s roll!

What’s in the Snippet?

Let’s take a look at our code snippet:

public static void main(String[] args) {

int num1 = 10;

int num2 = 5;

int num3 = 200;

num3 = num3 % (num1 * num2);

System.out.println(num3);

}

Alright, first things first. The code defines three integer variables: num1, num2, and num3. They start off with values 10, 5, and 200, respectively. But what does that mean when it comes to output? Let’s break it down.

Multiplication Magic

Here’s where the magic happens. The line:

num3 = num3 % (num1 * num2);

is the heart of the snippet. But before we dive into the modulus operation, we need to tackle the multiplication part. So, what’s num1 * num2?

It’s pretty simple: 10 times 5 equals 50. Now we have our next piece of the puzzle—50. Easy, right?

Modulus: What's That?

Now, onto the modulus operation. Basically, this nifty operator (%) gives us the remainder of a division. In our case, we're looking to find out what happens when we divide num3 (which is 200) by 50. You know what that equals?

200 divided by 50 is 4 with no remainder. Yep, you read that right. So when we perform:

num3 % 50

the remainder is 0. In programming terms, it means that num3 will now hold the value of 0. Wild, huh?

Printing the Result

Finally, the snippet finishes with:

System.out.println(num3);

This line simply prints the updated value of num3, which—after our little numerical adventure—is 0. And there you have it, folks! The output of the entire code snippet is 0. So when pop quiz day comes around, you’ll know exactly how to tackle questions like these.

Why Does This Matter?

You might be wondering why it’s crucial to understand this. Well, not only does it prepare you for the exams, but grasping these fundamental concepts lays a solid foundation as you advance in programming. It’s like building a house—without a sturdy base, everything else is shaky.

Plus, becoming comfortable with how operations work will help you debug your code and solve more complex problems in the future. And who knows? Maybe one day you'll be the one helping others unravel the mysteries of code!

A Quick Recap

1. Variables Defined: num1 = 10, num2 = 5, num3 = 200

2. Multiplication: num1 * num2 gives you 50

3. Modulus Operation: 200 % 50 results in a remainder of 0

4. Final Output: Print the new value of num3, which is now 0

Final Thoughts

Learning Java, or any programming language for that matter, can indeed take practice and patience. Don’t be discouraged if you feel overwhelmed; understanding these concepts will come with time, and soon they'll be second nature. Keep practicing, stay curious, and remember to have fun with it. Happy coding, and may your outputs always be as you expect!