Style fixes to decrease the executable size

These fixes also have a few efficiency boosts.
diff --git a/src/num.c b/src/num.c
index bada599..7e1452c 100644
--- a/src/num.c
+++ b/src/num.c
@@ -905,8 +905,8 @@
 	for (i = 0; zero && i < len; ++i) zero = (val[i] == '.' || val[i] == '0');
 	if (zero) return BC_STATUS_SUCCESS;
 
-	bc_num_init(&temp, BC_NUM_DEF_SIZE);
-	bc_num_init(&mult, BC_NUM_DEF_SIZE);
+	bc_num_init(&temp, BC_NUM_LONG_LOG10);
+	bc_num_init(&mult, BC_NUM_LONG_LOG10);
 
 	for (i = 0; i < len && (c = val[i]) && c != '.'; ++i) {