freemarker中的round、floor和ceiling数字的舍入处理

1、简易说明

（1）round:四舍五入

（2）floor:向下取整

（3）ceiling:向上取整

2、举例说明

     <#--freemarker中的round、floor和ceiling数字的舍入处理-->
     <#--round:四舍五入-->
     <#--floor:向下取整-->
     <#--ceiling:向上取整-->
     
     <#assign numList = [12,0.23,89,12.03,69.56,45.67,-0.56,-8.05,-89.56,4.69]/>
     <#list numList as num>
         ${num} ?round=${num?round} ?floor=${num?floor} ?ceiling=${num?ceiling}
     </#list>

<span style="white-space:pre">	</span> 12 ?round=12 ?floor=12 ?ceiling=12
         0.23 ?round=0 ?floor=0 ?ceiling=1
         89 ?round=89 ?floor=89 ?ceiling=89
         12.03 ?round=12 ?floor=12 ?ceiling=13
         69.56 ?round=70 ?floor=69 ?ceiling=70
         45.67 ?round=46 ?floor=45 ?ceiling=46
         -0.56 ?round=-1 ?floor=-1 ?ceiling=0
         -8.05 ?round=-8 ?floor=-9 ?ceiling=-8
         -89.56 ?round=-90 ?floor=-90 ?ceiling=-89
         4.69 ?round=5 ?floor=4 ?ceiling=5