Data commit

Task/Create-a-two-dimensional-array-at-runtime/Wren/create-a-two-dimensional-array-at-runtime.wren

@@ -0,0 +1,28 @@
+import "io" for Stdin, Stdout
+
+var x
+var y
+System.print("Enter the dimensions of the array:")
+while (true) {
+    System.write("  First dimension  : ")
+    Stdout.flush()
+    x = Num.fromString(Stdin.readLine())
+    if (x && (x is Num) && (x.isInteger) && (x > 0) ) {
+        System.write("  Second dimension : ")
+        Stdout.flush()
+        y = Num.fromString(Stdin.readLine())
+        if (y && (y is Num) && (y.isInteger) && (y > 0) ) break
+        System.print("Dimension must be a positive integer.")
+    } else {
+        System.print("Dimension must be a positive integer.")
+    }
+}
+// create the 2d array
+var a = List.filled(x, null)
+for (i in 0...x) a[i] = List.filled(y, 0)
+// write an element
+a[x - 1][y - 1] = 42
+// print it
+System.print("\na[%(x-1)][%(y-1)] = %(a[x-1][y-1])")
+// make the array eligible for garbage collection
+a = null