Exercise 3: Operators and Assignments

Please do this exercise in a group with other students.

Go through the questions and discuss the answers within your group. Write them down/remember them to share later with the class.

Exercise 3: Operators and Assignments
1. Objective
2. Questions

Objective

Goal of this exercise is to get a basic understanding of

how assignments to variables work
other notations fo assignments

Questions

Try to find the answers within your group (in case of questions/problems => ask one of your teachers!)

Question 1

Given the following code:

class Main {
    public static void main(String[] args) {
        int i = 4;
        int j = 2;
        
        i = j + 1;
        i = i * 2;
        j = (j * j) + i;
        
        System.out.println(i);
        System.out.println(j);
    }
}

can you guess what it will print?

Run the program and check the results.

Is it what you expected?

Question 2

Given the following code:

class Main {
    public static void main(String[] args) {
        int i = 4;
        
        i += 5;
        
        System.out.println(i);
    }
}

what does the program print?

What can you write instead of i += 5 that will get the same result?

Can you guess how you can do something similar for all mathematical operations (subtraction, multiplication, division)

Question 3

Given the following code:

class Main {
    public static void main(String[] args) {
        int i = 4;
        
        i++;
        
        System.out.println(i);
    }
}

what does the program print?

What can you write instead of i++ that will get the same result?

Can you do something similar for all mathematical operations (subtraction, multiplication, division)