Use double to store bets

The original basic allowed fractional bets.

10_Blackjack/java/src/Game.java

@@ -47,15 +47,15 @@ public class Game {
 		}
 
 		while(true) {
-			int[] bets = new int[nPlayers]; // empty array initialized with all '0' valuses.
+			double[] bets = new double[nPlayers]; // empty array initialized with all '0' valuses.
 			while(!betsAreValid(bets)){
 				userIo.println("BETS:");
 				for(int i = 0; i < nPlayers; i++) {
 					// Note that the bet for player "1" is at index "0" in the bets
 					// array and take care to avoid off-by-one errors.
 					// TODO the BASIC version allows fractional bets (e.g. '1.5') of arbitrary precision
-					//   We can use a float if we want--the original basic has floating point errors. Or we could use BigDecimal if we really want to fix that.
-					bets[i] = userIo.promptInt("#" + (i + 1));  //TODO: If there isn't a need for a separate Bets in the future, combine these two lines and convert to enhanced FOR loop
+					//   We can use a double if we want--the original basic has doubleing point errors. Or we could use BigDecimal if we really want to fix that.
+					bets[i] = userIo.promptDouble("#" + (i + 1));  //TODO: If there isn't a need for a separate Bets in the future, combine these two lines and convert to enhanced FOR loop
 					players.get(i).setCurrentBet(bets[i]);
 				}
 			}
@@ -244,14 +244,14 @@ public class Game {
 	}
 
 	/**
-	 * Validates that all bets are between 1 and 500 (inclusive).
+	 * Validates that all bets are between 0 (exclusive) and 500 (inclusive). Fractional bets are valid.
 	 * 
 	 * @param bets The array of bets for each player.
 	 * @return true if all bets are valid, false otherwise.
 	 */
-	public boolean betsAreValid(int[] bets) {
+	public boolean betsAreValid(double[] bets) {
 		return Arrays.stream(bets)
-			.allMatch(bet -> bet >= 1 && bet <= 500);
+			.allMatch(bet -> bet > 0 && bet <= 500);
 	}
 
 }

10_Blackjack/java/src/Player.java

@@ -3,8 +3,8 @@ import java.util.LinkedList;
 public class Player {
 
     private int playerNumber;     // e.g. playerNumber = 1 means "this is Player 1"
-    private int currentBet;
-    private int total;
+    private double currentBet;
+    private double total;
     private LinkedList<Card> hand;
     // TODO we'll need to decide how to deal with a split hand or doubled down bet.
 
@@ -26,11 +26,11 @@ public class Player {
         return this.playerNumber;
     }
     
-    public void setCurrentBet(int currentBet) {
+    public void setCurrentBet(double currentBet) {
         this.currentBet = currentBet;
     }
 
-    public int getCurrentBet() {
+    public double getCurrentBet() {
         return this.currentBet;
     }
 
@@ -52,7 +52,7 @@ public class Player {
      * Returns the total of all bets won.
      * @return Total value
      */
-    public int getTotal() {
+    public double getTotal() {
         return this.total;
     }
 

10_Blackjack/java/src/UserIo.java

@@ -132,4 +132,29 @@ public class UserIo {
 			}
 		}
 	}
+
+	/**
+	 * Prompts the user for a double.  As in Vintage Basic, "the optional
+	 * prompt string is followed by a question mark and a space." and if the
+	 * input is non-numeric, "an error will be generated and the user will be
+	 * re-prompted.""
+	 *
+	 * @param prompt The prompt to display to the user.
+	 * @return the number given by the user.
+	 */
+	public double promptDouble(String prompt) {
+		print(prompt + "? ");
+
+		while(true) {
+			String input = readLine();
+			try {
+				return Double.parseDouble(input);
+			} catch(NumberFormatException e) {
+				// Input was not numeric.
+				println("!NUMBER EXPECTED - RETRY INPUT LINE");
+				print("? ");
+				continue;
+			}
+		}
+	}
 }