94a65964d8
1. add int type array 2. The equality of floating-point numbers should be judged by the absolute value of the difference less than a small number
44 lines
1.3 KiB
Java
44 lines
1.3 KiB
Java
package Maths;
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/**
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* Calculate average of a list of numbers
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*/
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public class Average {
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private static final double SMALL_VALUE = 0.00001f;
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public static void main(String[] args) {
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assert Math.abs(average(new double[]{3, 6, 9, 12, 15, 18, 21}) - 12) < SMALL_VALUE;
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assert Math.abs(average(new double[]{5, 10, 15, 20, 25, 30, 35}) - 20) < SMALL_VALUE;
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assert Math.abs(average(new double[]{1, 2, 3, 4, 5, 6, 7, 8}) - 4.5) < SMALL_VALUE;
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int[] array = {2, 4, 10};
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assert average(array) == 5;
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}
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/**
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* Calculate average of a list of numbers
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*
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* @param numbers array to store numbers
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* @return mean of given numbers
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*/
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public static double average(double[] numbers) {
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double sum = 0;
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for (double number : numbers) {
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sum += number;
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}
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return sum / numbers.length;
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}
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/**
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* find average value of int array
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*
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* @param array the array contains element and the sum does not
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* excess long value limit
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* @return average value
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*/
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public static int average(int[] array) {
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long sum = 0;
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for (int i = 0 ; i < array.length; ++i) {
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sum += array[i];
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}
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return (int)(sum / array.length);
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}
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} |