calculator

src/main/java/rocks/zipcode/quiz5/collections/Food.java

@@ -9,6 +9,7 @@ import java.util.Map;
  * @author leon on 27/12/2018.
  */
 public class Food {
+
     public List<Spice> getAllSpices() {
         return null;
     }

src/main/java/rocks/zipcode/quiz5/fundamentals/Calculator.java

@@ -5,31 +5,44 @@ package rocks.zipcode.quiz5.fundamentals;
  */
 public class Calculator {
     public static Double squareRoot(Double value) {
-        return null;
+
+        return Math.sqrt(value);
     }
 
     public static Double square(Double value) {
-        return null;
+
+        return value * value;
     }
 
     public static Double[] squareRoots(Double... value) {
-        return null;
+        Double[] squareRoots = new Double[value.length];
+        for (int i = 0; i < value.length; i++) {
+            squareRoots[i] = Math.sqrt(value[i]);
+        }
+        return squareRoots;
     }
 
     public static Double[] squares(Double... values) {
-        return null;
+        Double[] squares = new Double[values.length];
+        for (int i = 0; i < squares.length ; i++) {
+            squares[i] = values[i] * values[i];
+        }
+        return squares;
     }
 
     public static Double add(Double value1, Double value2) {
-        return null;
+
+        return value1 + value2;
     }
 
     public static Double subtract(Double value1, Double value2) {
-        return null;
+
+        return value1 - value2;
     }
 
 
     public static Double divide(Double divisor, Double dividend) {
-        return null;
+
+        return divisor/dividend;
     }
 }