SET SERVEROUTPUT ON; DECLARE stock_price NUMBER :=9.73; net_earnings NUMBER :=0; pe_ratio NUMBER; BEGIN -- Calculation might cause division-by-zero error. pe_ratio := stock_price / net_earnings; dbms_output.put_line('Price/earnings ratio = '|| pe_ratio); EXCEPTION -- exception handlers begin -- Only one of the WHEN blocks is executed. WHEN ZERO_DIVIDE THEN-- handles 'division by zero' error dbms_output.put_line('Company must have had zero earnings.'); pe_ratio :=null; WHEN OTHERS THEN-- handles all other errors dbms_output.put_line('Some other kind of error occurred.'); pe_ratio :=null; END; -- exception handlers and block end here /