update cv3

cv3/program.c

@@ -65,6 +65,7 @@ int main(int argc, char const *argv[])
     {
         if(buf[0] == '\n')
         {
+            printf("no input\n");
             break;
         }
 
@@ -80,7 +81,7 @@ int main(int argc, char const *argv[])
         }
         for (int i = 0; i < calc_stack.size; i++)
         {
-            printf("%2.f ", calc_stack.values[i]);
+            printf("%.2f ", calc_stack.values[i]);
         }
         printf("\n");
     }