September 2017 Update

Task/Middle-three-digits/Dart/middle-three-digits.dart

@@ -0,0 +1,46 @@
+import'dart:math';
+  int length(int x)
+  {
+    int i,y;
+  for(i=0;;i++)
+  {
+    y=pow(10,i);
+    if(x%y==x)
+      break;
+  }
+    return i;
+  }
+ int middle(int x,int l)
+  {
+ int a=(x/10)-((x%10)/10);
+  int b=a%(pow(10,l-2));
+  int l2=length(b);
+      if(l2==3)
+      {
+        return b;
+      }
+    if(l2!=3)
+      {
+        return middle(b,l2);
+      }
+  return 0;
+  }
+
+
+main()
+{
+  int x=-100,y;
+  if(x<0)
+ x=-x;
+  int l=length(x);
+  if(l.isEven||x<100)
+  {print('error');}
+    if(l==3)
+  {print('$x');}
+
+  if(l.isOdd&& x>100)
+  {
+   y=middle(x,l);
+  print('$y');
+  }
+}