1 files changed, 3 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
index ecb79e8..e415020 100644
--- a/src/main.c
+++ b/src/main.c
@@ -58,6 +58,9 @@ int main(int argc, char **argv) {
       result = strtol(argv[i], &output, 10);
       value = true;
     }
+  } else {
+    printhelp();
+    return ERR;
   }
   if (value) {
     if (result % 2 == 0) {