1 files changed, 7 insertions, 0 deletions

diff --git a/src/tests/formula.cpp b/src/tests/formula.cpp
index 635d73f..429c306 100644
--- a/src/tests/formula.cpp
+++ b/src/tests/formula.cpp
@@ -9,10 +9,17 @@
 
 int main( int argc, char *argv[] )
 {
+        if( argc < 2 )
+        {
+                printf("usage: %s <formula>\n", argv[0] );
+                return -1;
+        }
         Bu::Formula<uint32_t> uForm;
         Bu::Formula<double> dForm;
 
         printf("u: %s = %u\n", argv[1], uForm.run( argv[1] ) );
         printf("d: %s = %f\n", argv[1], dForm.run( argv[1] ) );
+
+        return 0;
 }