AP Computer Science Exam Question

public class MathUtils {
    
    /**
     * Returns the average of two given numbers.
     * 
     * @param num1 the first number
     * @param num2 the second number
     * @return the average of num1 and num2
     */
    public static double average(int num1, int num2) {
        return (num1 + num2) / 2.0;
    }
    
    public static void main(String[] args) {
        // Calculate the average of 5 and 10
        double result = average(5, 10);
        System.out.println("Average: " + result);
    }
}

Explanation

The given code defines a class named MathUtils with a method average that calculates the average of two given numbers. The average method takes two integer parameters, num1 and num2, and returns the average as a double value. The main method is used to test the average method by invoking it with the values 5 and 10, and printing the result.

To calculate the average, the average method uses the formula (num1 + num2) / 2.0 to ensure the result is a double value.

In the main method, the average method is invoked by passing the arguments 5 and 10. The returned result is stored in a variable named result. Finally, the result is printed using the System.out.println statement.

When we run the code, the output will be:

Average: 7.5

The output shows that the average of 5 and 10 is indeed 7.5, which is the expected result.