@@ -130,7 +130,7 @@ static void stack_machine(const char *argument)
int math_main(int argc, char **argv)
{
if (argc < 1 || *argv[1]=='-')
if (argc <= 1 || *argv[1]=='-')
usage(math_usage);
while (argc >= 2) {
stack_machine(argv[1]);
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