September 2017 Update

Task/Middle-three-digits/S-lang/middle-three-digits.slang

@@ -0,0 +1,29 @@
+define m3(i)
+{
+    variable s = string(i), sabs = s, l;
+
+    if (sabs[0] == '-')
+        sabs = sabs[[1:]];
+    l = strlen(sabs);
+
+    if (l < 3)
+        print(sprintf("%s doesn't have enough digits", s));
+    else if (l & 1) {
+        variable st = (l-3) >> 1;
+        print(sprintf("%13s: %s", s, sabs[[st:st+2]]));
+    }
+    else
+        print(sprintf("%s has an even number of digits", s));
+}
+
+define middle_3(lst)
+{
+    foreach (lst)
+        m3( () );
+}
+
+middle_3( { 123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345,
+#ifexists Int64_Type
+         6644221335577ll, -11122588999ll,
+#endif
+         1, 2, -1, -10, 2002, -2002, 0 } );