initial commit

c/hamming/src/hamming.c

@@ -0,0 +1,41 @@
+#include "hamming.h"
+
+/* Note: For explanation on section below, see 'GNUfilename' included in
+ * link below :
+ * https://exercism.io/my/solutions/103b2f7d92db42309c1988030f5202c7
+ */
+#if defined UNIT_TEST || defined DEBUG
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+/* test does not include invalid input, but it should, as the subject is
+ * about DNA sequence, not ASCII chars sequence :-)
+ * exercism test needs only:
+ *     #define V(p) (*p)
+ */
+#define V(p) (*(p)=='A' || *(p)=='C' || *(p)=='G' || *(p)=='T')
+
+int compute(const char *lhs, const char *rhs)
+{
+    int res=0;
+    const char *l=lhs, *r=rhs;
+
+    if (!l || !r)
+        return -1;
+    for (; V(l) && V(r); ++l, ++r) {
+        if (*l != *r)
+            res++;
+    }
+    return *r || *l? -1: res;
+}
+
+
+#ifdef UNIT_TEST
+int main(int ac, char **av)
+{
+    if (ac==3) {
+        printf("compute(%s, %s)=%d\n", *(av+1), *(av+2), compute(*(av+1), *(av+2)));
+    }
+}
+#endif

c/hamming/src/hamming.h

@@ -0,0 +1,15 @@
+#ifndef HAMMING_H
+#define HAMMING_H
+
+int compute(const char *lhs, const char *rhs);
+
+/* Note: For explanation on section below, see 'GNUfilename' included in
+ * link below :
+ * https://exercism.io/my/solutions/103b2f7d92db42309c1988030f5202c7
+ */
+#ifdef  TESTALL
+#undef  TEST_IGNORE
+#define TEST_IGNORE() {}
+#endif
+
+#endif