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Task/Odd-word-problem/C/odd-word-problem.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <ctype.h>
+
+int do_char(int odd, void (*f)(void))
+{
+	int c = getchar();
+
+	void write_out(void) {
+		putchar(c);
+		if (f) f();
+	}
+
+	if (!odd) putchar(c);
+
+	if (isalpha(c))
+		return do_char(odd, write_out);
+
+	if (odd) {
+		if (f) f();
+		putchar(c);
+	}
+
+	return c != '.';
+}
+
+int main()
+{
+	int i = 1;
+	while (do_char(i = !i, 0));
+
+	return 0;
+}