train in Lua and D

00_Alternate_Languages/91_Train/D/README.md

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+Original source downloaded from [Vintage Basic](http://www.vintage-basic.net/games.html).
+
+Conversion to [MiniScript](https://dlang.org).

00_Alternate_Languages/91_Train/D/train.d

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+import std.stdio;
+import std.random : uniform;
+
+float abs(float num) {
+    if(num<0){
+        return num*-1;
+    }
+
+    return num;
+}
+
+void main() {
+    
+    writeln("\nTIME - SPEED DISTANCE EXERCISE");
+
+    bool keep_playing = true;
+    float error_margin = 5.0;
+
+    while(keep_playing){
+        int car_speed = uniform!"[]"(40,65);       //Random number between 40 and 65
+        int delta_time = uniform!"(]"(4,20);       //Between 5 and 20
+        int train_speed = uniform!"[)"(20,40);     //Between 20 and 39; This is the default if not specified: uniform(x,y)
+
+        writeln("\nA CAR TRAVELING AT ", car_speed, " MPH CAN MAKE A CERTAIN TRIP IN ", delta_time,
+                " HOURS LESS THAN A TRAIN TRAVELING AT ", train_speed, "MPH." );
+        
+        float input;
+        write("HOW LONG DOES THE TRIP TAKE BY CAR? ");
+        readf!"%f\n"(input);
+
+        float car_time = cast(float)delta_time * train_speed / (car_speed - train_speed);
+        int percent = cast(int)( abs(car_time-input) * 100 / car_time + .5);
+
+        if(percent > error_margin){
+            writeln("SORRY. YOU WERE OFF BY ", percent, " PERCENT.");
+        }else{
+            writeln("GOOD! ANSWER WITHIN ", percent, " PERCENT.");
+        }
+        writeln("CORRECT ANSWER IS ", car_time, " HOURS.");
+
+        string answer;
+        write("\nANOTHER PROBLEM (YES OR NO)? ");
+        readf!"%s\n"(answer);
+
+        if( !(answer == "YES" || answer == "Y" || answer == "yes" || answer == "y") ){
+            keep_playing = false;
+        }
+    }
+
+}

91_Train/lua/train.lua

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+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()