jstl set out
<c:set var="num1" value="9"/> <c:set var="num2" value="2"/> <c:out value="${num1}"/> <br /> <c:out value="${num2}"/> <br /> <c:out value="${num1+num2}"/> JSTL tag ex) : https://ahnsk39.blogspot.com/2017/08/jstljsp-standard-tag-library.html