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Task/Odd-word-problem/D/odd-word-problem.d

@@ -0,0 +1,19 @@
+bool doChar(in bool odd, in void delegate() nothrow f=null) nothrow {
+    import core.stdc.stdio, std.ascii;
+
+    immutable int c = getchar;
+    if (!odd)
+        c.putchar;
+    if (c.isAlpha)
+        return doChar(odd, { c.putchar; if (f) f(); });
+    if (odd) {
+        if (f) f();
+        c.putchar;
+    }
+    return c != '.';
+}
+
+void main() {
+    bool i = true;
+    while (doChar(i = !i)) {}
+}