train in Lua and D

91_Train/lua/train.lua

@@ -0,0 +1,59 @@
+print [[
+            TRAIN
+ CREATIVE COMPUTING  MORRISTOWN, NEW JERSY
+
+
+
+ TIME - SPEED DISTANCE EXERCISE]]
+
+math.randomseed(os.time())
+
+local error_margin = 5.0
+
+function play()
+    local car_speed = math.random(40, 65)
+    local delta_time = math.random(5, 20)
+    local train_speed = math.random(20, 39)
+
+    print( string.format("\nA CAR TRAVELING AT %u MPH CAN MAKE A CERTAIN TRIP IN %u HOURS LESS THAN A TRAIN TRAVELING AT %u MPH.", car_speed, delta_time, train_speed) )
+
+    local try = true
+    local input
+    while try do
+        io.write("HOW LONG DOES THE TRIP TAKE BY CAR? ")
+        input = io.read("n")
+        if input == nil then
+            print("<!>PLEASE INSERT A NUMBER<!>")
+        else
+            try = false
+        end
+        io.read()
+    end
+
+    local car_time = delta_time * train_speed / (car_speed - train_speed)
+    local percent = ( math.abs(car_time-input) * 100 / car_time + .5)
+
+    if percent > error_margin then
+        print( string.format("SORRY. YOU WERE OFF BY %f PERCENT.", percent) )
+    else
+        print( string.format("GOOD! ANSWER WITHIN %f PERCENT.", percent) )
+    end
+    
+    print( string.format("CORRECT ANSWER IS %f HOURS.", car_time) )
+end
+
+function game_loop()
+    local keep_playing = true
+    while keep_playing do
+        play()
+        io.write("\nANOTHER PROBLEM (YES OR NO)? ")
+        answer = io.read("l")
+        
+        if not (answer == "YES" or answer == "Y" or answer == "yes" or answer == "y") then
+            keep_playing = false
+        end
+    end
+
+end
+
+game_loop()