June 2018 Update

Task/Safe-addition/Java/safe-addition.java

@@ -0,0 +1,20 @@
+public class SafeAddition {
+    private static double stepDown(double d) {
+        return Math.nextAfter(d, Double.NEGATIVE_INFINITY);
+    }
+
+    private static double stepUp(double d) {
+        return Math.nextUp(d);
+    }
+
+    private static double[] safeAdd(double a, double b) {
+        return new double[]{stepDown(a + b), stepUp(a + b)};
+    }
+
+    public static void main(String[] args) {
+        double a = 1.2;
+        double b = 0.03;
+        double[] result = safeAdd(a, b);
+        System.out.printf("(%.2f + %.2f) is in the range %.16f..%.16f", a, b, result[0], result[1]);
+    }
+}