PUT输出问题

data _null_;

set mix;

put @2 x$ @;

put y 5-10 .2 @;

put @15 z:5.3 @;

put (m n p)(best10. "---" 4.2 "---" 4.2) @;

put @60 q=;

run;

y 5-10.2输出有错？但是出自《SAS编程与数据挖掘商业案例》