refresh

du3/program.c

@@ -67,7 +67,7 @@ int main() {
             print_stack(s);
         } else if (strcmp(input, "+")==0 || strcmp(input, "-")==0 || strcmp(input, "*")==0 || strcmp(input, "/")==0) {
             if (s->size < 2) {
-                printf("no input\n");
+                printf("not enough operands\n");
                 destroy_stack(s);
                 return 0;
             }