Data commit

Task/Middle-three-digits/Seed7/middle-three-digits.seed7

@@ -0,0 +1,24 @@
+$include "seed7_05.s7i";
+
+const func string: middle3 (in integer: number) is func
+  result
+    var string: middle3 is "";
+  begin
+    middle3 := str(abs(number));
+    if not odd(length(middle3)) or length(middle3) < 3 then
+      middle3 := "error";
+    else
+      middle3 := middle3[succ((length(middle3) - 3) div 2) len 3];
+    end if;
+  end func;
+
+const proc: main is func
+  local
+    var integer: number is 0;
+    var string: mid3 is "";
+  begin
+    for number range [] (123, 12345, 1234567, 987654321, 10001, -10001, -123,
+                         -100, 100, -12345, 1, 2, -1, -10, 2002, -2002, 0) do
+      writeln(number <& ": " <& middle3(number));
+    end for;
+  end func;