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+# Finding zeros in digits of powers of two
+
+I wrote the Haskell version first, then the C version for speed.
+
+Both programs take an optional command-line argument, the power of two to start
+from (e.g. `zeros 10` starts from 1024).
+
+## Try it in C
+
+```{sh}
+$ gcc -O2 zeros.c -lgmp -o zeros
+$ ./zeros
+```
+
+## Try it in Haskell
+
+```{sh}
+$ ghc -O2 -dynamic -o zeros.haskell zeros.hs
+$ ./zeros.haskell
+```