spacs age (C)

c/space-age/src/space_age.c

@@ -0,0 +1,41 @@
+#include <time.h>
+#include "space_age.h"
+
+/* 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
+
+static float relative[] = {
+    0.2408467,
+    0.61519726,
+    1.0,
+    1.8808158,
+    11.862615,
+    29.447498,
+    84.016846,
+    164.79132
+};
+#define EARTH_SECS 31557600
+
+float age(planet_t p, int64_t s)
+{
+    return s/EARTH_SECS/relative[p];
+}
+
+#ifdef UNIT_TEST
+int main(int ac, char **av)
+{
+    int arg=1, i;
+    float f;
+
+    for (; arg<ac-1; ++arg, ++arg) {
+        i=atoi(av[arg]);
+        f=atof(av[arg+1]);
+        printf("age(%d, %f)=%f\n", i, f, age(i, f));
+    }
+}
+#endif