DivideTwoNumbers()

Step 1: Understand the Problem

First, you need to understand the problem. The task at hand is to create a function in Java that can divide two numbers.

Step 2: Declare the Method

The first piece of code you'll need to write is the declaration of the function. Java functions are declared with their output type, the function name, and the input parameters. In this case, the function will be called 'divideTwoNumbers', and it will take two input parameters: the numerator and the denominator.

public static double divideTwoNumbers(int numerator, int denominator){}

Step 3: Write the Division Logic

Inside the function, you'll divide the numerator by the denominator. Care should be taken to handle the possibility of division by zero, which is undefined and will cause an error at runtime. Return the result of the division as the output.

public static double divideTwoNumbers(int numerator, int denominator){
    if(denominator == 0) {
        throw new IllegalArgumentException("Denominator cannot be zero.");
    }

    return (double) numerator / denominator;
}

Step 4: Test the Function

It's important to test your function to ensure it behaves as expected. You can run your function with some test cases to do this.

public static void main(String[] args) {
    System.out.println(divideTwoNumbers(10, 2));
    System.out.println(divideTwoNumbers(7, 0));
}

Conclusion

Writing a function to divide two numbers in Java involves understanding the requirement, declaring the function, implementing the division logic, and testing for accuracy. Always be careful to handle potential exceptions, such as division by zero, to prevent runtime errors. Here is the complete code including the main method to test the function:

public class Main {
    public static double divideTwoNumbers(int numerator, int denominator){
        if(denominator == 0) {
            throw new IllegalArgumentException("Denominator cannot be zero.");
        }

        return (double) numerator / denominator;
    }

    public static void main(String[] args) {
        System.out.println(divideTwoNumbers(10, 2));
        try {
            System.out.println(divideTwoNumbers(7, 0));
        } catch (IllegalArgumentException e) {
            System.out.println(e.getMessage());
        }
    }
}