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type:$type_var
alias:evalue
mean:·µ»Ø±í´ïʽ `expr' µÄÊýÖµ,\
¶øÇÒÊÇʵÊý(¶ÔÓÚÄ¿Ç°µÄwims°æ±¾). ÄÚ²¿¼ÆËãÊÇÒÔË«¾«¶È½øÐеÄ,\
µ«´òÓ¡¾«¶ÈÓɱäÁ¿ `wims_print_precision' È·¶¨(ÆäĬÈÏÖµÊÇ 8). <br>\
Èç¹ûÔÚ±í´ïʽ `expr' ÄÚ³ö´í, Ôò·µ»Ø 0.\
(ÎÒÖªµÀÕâ²»ºÃ; µ«Ä¿Ç°ÎÒ»¹Ã»ÓÐʱ¼ä¸ã¶¨.)