1 files changed, 8 insertions, 5 deletions
diff --git a/test-instr.c b/test-instr.c
index 71838462..3750b1b5 100644
--- a/test-instr.c
+++ b/test-instr.c
@@ -23,15 +23,19 @@ int main(int argc, char** argv) {
   char  buff[8];
   char* buf = buff;
 
-  if (argc > 1)
+  // we support command line parameter and stdin
+  if (argc > 1) {
+
     buf = argv[1];
-  else if (read(0, buf, sizeof(buf)) < 1) {
+
+  } else if (read(0, buf, sizeof(buf)) < 1) {
 
     printf("Hum?\n");
-    exit(1);
+    return 1;
 
   }
 
+  // we support three input cases (plus a 4th if stdin is used but there is no input)
   if (buf[0] == '0')
     printf("Looks like a zero to me!\n");
   else if (buf[0] == '1')
@@ -39,7 +43,6 @@ int main(int argc, char** argv) {
   else
     printf("Neither one or zero? How quaint!\n");
 
-  exit(0);
+  return 0;
 
 }
-