diff --git a/ch03/Convert.java b/ch03/Convert.java
index d31fe77..7f75210 100644
--- a/ch03/Convert.java
+++ b/ch03/Convert.java
@@ -12,16 +12,41 @@ public static void main(String[] args) {
         final int IN_PER_FOOT = 12;
         Scanner in = new Scanner(System.in);
 
-        // prompt the user and get the value
-        System.out.print("Exactly how many cm? ");
-        cm = in.nextDouble();
-
-        // convert and output the result
-        inches = (int) (cm / CM_PER_INCH);
-        feet = inches / IN_PER_FOOT;
-        remainder = inches % IN_PER_FOOT;
-        System.out.printf("%.2f cm = %d ft, %d in\n",
-                          cm, feet, remainder);
+        System.out.print("Enter 1 to convert centimeters to feet and inches\n"
+                         + "Enter 2 to convert feet and inches to centimeters\n"
+                         + "Your choice: ");
+
+        int choice = in.nextInt();
+
+        if (choice == 1) {
+            System.out.print("Exactly how many cm? ");
+            cm = in.nextDouble();
+
+            if (cm < 0) {
+                System.out.print("Please enter a positive value for centimeters.");
+            } else {
+                inches = (int) (cm / CM_PER_INCH);
+                feet = inches / IN_PER_FOOT;
+                remainder = inches % IN_PER_FOOT;
+                inches = inches - (feet * IN_PER_FOOT);
+                System.out.printf("%.2f cm = %d ft, %d in\n", cm, feet, inches);
+            }
+        } else if (choice == 2) {
+            System.out.print("Enter feet: ");
+            feet = in.nextInt();
+            System.out.print("Enter inches: ");
+            inches = in.nextInt();
+
+            if (feet < 0 || inches < 0 || inches >= IN_PER_FOOT) {
+                System.out.println("Please enter valid and positive values for feet and inches.");
+            } else {
+                cm = (feet * IN_PER_FOOT + inches) * CM_PER_INCH;
+                System.out.printf("%d ft, %d in = %.2f cm\n", feet, inches, cm);
+            }
+        } else {
+            System.out.println("Invalid choice, please enter 1 or 2.");
+        }
+
     }
 
 }