import cs1.Keyboard;
public class Exchange {
   public static void main(String[] args) {
      System.out.println("This program exchanges US dollars into Uganda shillings.");
      System.out.println("Enter the amount in US dollars.");
      float dollars = Keyboard.readFloat();
      System.out.println("Enter the exchange rate.");
      float rate = Keyboard.readFloat();
	if (dollars < 0)
         System.out.println("Error: dollars must be a positive amount.");
	else
	if (rate < 0)
         System.out.println("Error: rate must be a positive amount.");
      else
         System.out.println(dollars + " US dollars is " + (dollars * rate) + " Uganda Shillings.");
   }
}