Parameters and return values

1 Learn

Parameters are inputs to a method. You list them in the brackets with their types.

A method can send back a result with return. The return type (like int) is written before the method name.

2 See the Code

Java

public class Calc {
    static int add(int a, int b) {
        return a + b;
    }

    static double average(int a, int b) {
        return (a + b) / 2.0;
    }

    public static void main(String[] args) {
        int sum = add(4, 6);
        System.out.println("Sum: " + sum);
        System.out.println("Average: " + average(4, 7));
    }
}

add takes two ints and returns their sum.
Dividing by 2.0 keeps the decimal part, so average(4, 7) is 5.5.
The returned value can be stored in a variable or printed directly.

Output

Sum: 10
Average: 5.5

3 Practice

Write a method isEven(int n) that returns a boolean, and print the result for 7 and 10.

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

4 Quick Check

1. In add(int a, int b), what are a and b?
2. What does return do?

Step 5

Answer and check the Quick Check above to unlock this.

Day 8