Latest 'stuff'

1 files changed, 35 insertions, 0 deletions

diff --git a/randtest.c b/randtest.c
new file mode 100644
index 0000000..06a71de
--- /dev/null
+++ b/randtest.c
@@ -0,0 +1,35 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define FROM 0
+#define TO   9
+
+int8_t randrange(int8_t from, int8_t to)
+{
+        int base_random = rand();
+        if (RAND_MAX == base_random) return randrange(from, to);
+        int range = to - from,
+            remainder = RAND_MAX % range,
+           bucket = RAND_MAX / range;
+        if (base_random < RAND_MAX - remainder) {
+                return from + base_random/bucket;
+        } else {
+                return randrange(from, to);
+        }
+}
+
+int main(int argc, char **argv)
+{
+        srand(time(NULL));
+        int r;
+        uint16_t *amounts = calloc(sizeof(uint16_t), (TO - FROM + 1));
+        for (int i = 0; i < 1000; i++)
+                amounts[randrange(FROM, TO) - FROM]++;
+
+        for (int i = 0; i < TO - FROM + 1; i++)
+                printf("%d: %d\n", i, amounts[i]);
+
+        return 0;
+}