Operators

1 Learn

Operators do work on values. Arithmetic: + - * / %. The % operator gives the remainder.

Relational operators compare values and give true or false: == != > < >= <=.

Logical operators combine conditions: && (and), || (or), ! (not). Assignment operators store values: =, +=, -=.

Careful: dividing two ints gives an int. 7 / 2 is 3, not 3.5.

Want more detail? Open the full lesson

2 See the Code

Java

public class Ops {
    public static void main(String[] args) {
        int a = 7, b = 2;
        System.out.println(a / b);
        System.out.println(a % b);
        System.out.println(a > b && b > 0);
        int score = 10;
        score += 5;
        System.out.println(score);
    }
}

7 / 2 is integer division, so the result is 3.
7 % 2 is the remainder, 1.
a > b && b > 0 — both are true, so the result is true.
score += 5 means score = score + 5.

Output

3
1
true
15

3 Practice

Write a program that checks whether a number is even using % and prints true or false.

Try it in your own Java setup or write it in the Practice Notebook.

4 Quick Check

1. What is 10 % 3?
2. Which operator means AND?
3. What does == do?

Step 5

Answer and check the Quick Check above to unlock this.

Day 2