Created Quadratic.java

Java-Assignment-005.iml

@@ -5,6 +5,7 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
+    <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>

src/Quadratic.java

@@ -0,0 +1,64 @@
+import java.util.Scanner;
+
+/**
+ *
+ * @author James Ward
+ *
+ * @since 02/25/2024
+ *
+ */
+
+public class Quadratic {
+
+    public static void main(String[] args) {
+
+        System.out.println("Enter positive integer values for variables a, b, and c in to calculate to roots of the quadratic equation ax^2 + bx + c = 0. Positive integers only.");
+
+        // prompt for each variable
+        int a = userInput("a");
+        int b = userInput("b");
+        int c = userInput("c");
+
+        // calculate roots
+        double[] roots = quadraticEquation(a, b, c);
+        System.out.printf("The roots of the quadratic equation are: %.2f and %.2f%n", roots[0], roots[1]);
+
+    }
+
+    public static int userInput(String variableString) {
+
+        Scanner in = new Scanner(System.in);
+
+        System.out.println("Enter value for " + variableString + ": ");
+
+        if (!in.hasNextInt()) {
+            String message = in.next();
+            System.err.println("Input " + message + " is not a positive integer.");
+            return userInput(variableString);
+        }
+
+        return in.nextInt();
+    }
+
+    public static double[] quadraticEquation(int a, int b, int c) {
+
+        // check for division by zero
+        if (a == 0) {
+            System.err.println("Invalid input: 'a' can't be zero");
+        }
+
+        // calculate the discriminant
+        double discriminant = b * b - 4 * a * c;
+
+        // check for negative discriminant
+        if (discriminant < 0) {
+            System.err.println("No real roots: Discriminant is negative");
+        }
+
+        // Calculate the solutions
+        double root1 = (-b + Math.sqrt(discriminant)) / (2 * a);
+        double root2 = (-b - Math.sqrt(discriminant)) / (2 * a);
+
+        return new double[]{root1, root2};
+    }
+}