update,

_resources/it114105/itp3914/Lab06/Ex9.java

@@ -0,0 +1,27 @@
+import java.util.Scanner;
+
+public class Ex9 {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        double a, b, c;
+        System.out.print("Enter a: ");
+        a = input.nextDouble();
+        System.out.print("Enter b: ");
+        b = input.nextDouble();
+        System.out.print("Enter c: ");
+        c = input.nextDouble();
+
+        
+        if(a == 0)
+            System.out.println("This is not a quadratic equation.");
+        else{
+            double discriminan = b*b - 4*a*c;
+            if(discriminan > 0)
+                System.out.printf("2 roots, x1=%.1f, x2=%.1f\n", (-b+Math.sqrt(discriminan))/(2*a), (-b-Math.sqrt(discriminan))/(2*a));
+            else if (discriminan == 0)
+                System.out.printf("1 root, x=%.1f\n", (-b+Math.sqrt(discriminan))/(2*a));
+            else
+                System.out.println("No real solution");
+        }
+    }
+}