diff --git a/MyInterface.class b/MyInterface.class
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diff --git a/MyInterface.java b/MyInterface.java
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+++ b/MyInterface.java
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+public interface MyInterface {
+  public double compute(double a, double b, double c, int iteration);
+}
diff --git a/Quadratic.class b/Quadratic.class
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diff --git a/Quadratic.java b/Quadratic.java
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+public class Quadratic implements MyInterface {
+  public double compute(double a, double b, double c, int iteration) {
+    double answer = 0;
+    if (iteration == 1) {
+      answer = (-b + Math.sqrt(Math.pow(b, 2) - 4*a*c)) / (2*a);
+    }
+    if (iteration == 2) {
+      answer = (-b - Math.sqrt(Math.pow(b, 2) - 4*a*c)) / (2*a);
+    }
+    return answer;
+  }
+
+}
diff --git a/mainCompute.class b/mainCompute.class
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diff --git a/mainCompute.java b/mainCompute.java
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+++ b/mainCompute.java
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+import java.util.Scanner;
+
+public class mainCompute{
+
+  public static void main(String[] args) {
+    Scanner scan = new Scanner(System.in);
+
+    MyInterface getQuadratic = new Quadratic();
+
+    System.out.println("Ruutvõrrandi arvutaja\n\nPalun sisestage ruutvõrrandi jaoks vajalikud andmed");
+    System.out.println("A (ruudus): ");
+    double a = scan.nextDouble();
+    System.out.println("B: ");
+    double b = scan.nextDouble();
+    System.out.println("C: ");
+    double c = scan.nextDouble();
+    System.out.println("\nVastus 1: " + getQuadratic.compute(a, b, c, 1));
+    System.out.println("Vastus 2: " + getQuadratic.compute(a, b, c, 2));
+  }
+}