C: raindrops

c/raindrops/src/raindrops.c

@@ -0,0 +1,29 @@
+#include "raindrops.h"
+#include <stdio.h>
+
+char *convert(char result[], int drops)
+{
+    char *p=result;
+
+    if (!(drops%3)) p+=sprintf(p, "%s", "Pling");
+    if (!(drops%5)) p+=sprintf(p, "%s", "Plang");
+    if (!(drops%7)) p+=sprintf(p, "%s", "Plong");
+    if (p==result) sprintf(p, "%d", drops);
+    return result;
+}
+
+/* See GNUmakefile below for explanation
+ * https://github.com/braoult/exercism/blob/master/c/templates/GNUmakefile
+ */
+#ifdef UNIT_TEST
+int main(int ac, char **av)
+{
+    int arg=1, i;
+    char buffer[128];
+
+    for (; arg<ac; ++arg) {
+        i=atoi(av[arg]);
+        printf("raindrops(%d)=%s\n", i, convert(buffer, i));
+    }
+}
+#endif

c/raindrops/src/raindrops.h

@@ -0,0 +1,18 @@
+#ifndef RAINDROPS_H
+#define RAINDROPS_H
+
+char *convert(char result[], int drops);
+
+/* See GNUmakefile below for explanation
+ * https://github.com/braoult/exercism/blob/master/c/templates/GNUmakefile
+ */
+#if defined UNIT_TEST || defined DEBUG
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+#ifdef  TESTALL
+#undef  TEST_IGNORE
+#define TEST_IGNORE() {}
+#endif
+
+#endif