Average of 3 numbers (included number rounding)

The following code snippet calculates the average of 3 numbers. The average is rounded by different rounding methods.

Code Explanation

class AvgNumbers {
	private static double roundDouble(double value, int decimalPoints) {
		double d = Math.pow(10, decimalPoints);
		return Math.round(value * d) / d;
	 }

	public static void main(String[] args) {
		// declare variables
		double a, b, c, avg; 

		// initialize variables
		a = 11.54;
		b = 7.73;
		c = 10.54;
		
		avg = (a + b + c) / 3;

		System.out.println("Average of " + a + ", " + b + " and " + c + " is: " + avg);
		System.out.println("Rounded value:\n"
							+ String.format("%1.2f", avg) + "\n"
							+ Math.round(avg) + "\n"
							+ roundDouble(avg, 2) + "\n");
	}
}

Output

Average of 11.54, 7.73 and 10.54 is: 9.936666666666666
Rounded value:
9.94
10
9.94