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Warning: Undefined variable $abs in /users/2018/i1858031/public_html/2019/webprog/ch03/exam03-05.php on line 19

Fatal error: Uncaught Error: Value of type null is not callable in /users/2018/i1858031/public_html/2019/webprog/ch03/exam03-05.php:19 Stack trace: #0 {main} thrown in /users/2018/i1858031/public_html/2019/webprog/ch03/exam03-05.php on line 19