Merge branch 'coding-horror:main' into main

29_Craps/ruby/craps.rb

@@ -0,0 +1,125 @@
+class CRAPSGAME
+
+    # class variables start with a double "@"
+    @@standings = 0
+
+    def displayHeading
+        puts "CRAPS".center(80)
+        puts "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY".center(80)
+        puts "\n\n\n"
+        puts "2,3,12 are losers"
+        puts "4,5,6,8,9,10 are points"
+        puts "7,11 are natural winners.\n\n"
+    end
+
+    def displayStanding
+        if @@standings < 0
+            print "you are in the hole by "
+        elsif @@standings == 0
+            print "you currently have "
+        else
+            # show how much money we currently have
+            print "you now have won "
+        end
+           # print the absolute value of the amount in the standings
+        puts @@standings.abs.to_s + " dollars"
+    end
+
+    # dice can come up 2 through 12
+    # so return a minimum of 2 and add 0 through 10 to that
+    def rollDice
+        puts "I will now throw the dice"
+        return rand(5) + rand(5) + 2
+    end
+
+    def placeBet
+        print "How much do you want to wager? "
+        wager = gets.strip.to_i
+        return wager
+    end
+
+    def loseBetBy amount
+        @@standings -= amount
+    end
+
+    def winBetBy amount
+        @@standings += amount
+    end
+
+    def askQuit?
+        print "\nDo you want to play again? "
+        # just the first character, make it uppercase
+        again = gets.strip.upcase[0]
+        return again != "Y"
+    end
+
+    def pointRoll point, wager
+        while true do
+            puts " is the point."
+            puts " I will roll again when you press Enter."
+            waitForIt = gets
+            roll = rollDice
+            print roll.to_s
+
+            # the only critical rolls here are 7 and the previous roll
+            # if anything else comes up we roll again.
+            case roll.to_i
+                when 7
+                    puts " craps - you lose"
+                    loseBetBy wager
+                    break
+                when point
+                    puts " is a winner! congrats!"
+                    puts "at 2 to 1 odds pays you " + (2 * wager).to_s + " dollars"
+                    winBetBy 2 * wager
+                    break
+                else
+                    print " no point - " + point.to_s
+           end
+        end
+    end
+
+    def play
+        displayHeading
+        
+        while true do
+            wagerAmount = placeBet
+            roll = rollDice
+            print roll.to_s
+            case roll
+                when 2
+                    puts " snake eyes - you lose"
+                    loseBetBy wagerAmount
+                when 3, 12
+                    puts " craps - you lose"
+                    loseBetBy wagerAmount
+                when 4, 5, 6, 8, 9, 10
+                    pointRoll roll, wagerAmount
+                when 7, 11
+                    puts " a natural - a winner"
+                    puts "pays even money: " + wagerAmount.to_s + " dollars"
+                    winBetBy wagerAmount
+            end
+            displayStanding
+            if askQuit?
+                endPlay
+            end
+        end
+    end
+
+    def endPlay
+        case
+            when @@standings < 0
+                puts "Too bad. You are in the hole " + @@standings.abs.to_s + " dollars. Come again."
+            when @@standings > 0
+                puts "Congratulations --- You came out a winner of " + @@standings.to_s + " dollars. Come again!"
+            when @@standings == 0
+                puts "Congratulations --- You came out even, not bad for an amateur"
+        end
+        exit
+    end
+end
+
+craps = CRAPSGAME.new
+craps.play
+