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在fortran中，使用双斜线//对字符串进行连接。（很奇怪的用法）

下面是一个例子。
CHARACTER*20 FILE1,FILE2
CHARACTER*3 prefix
CHARACTER*40 FILE11
write(*,*)'Please input the original data file name:'
read(*,*) file1
prefix='yx_'
file11=prefix//file1 ! or file11='yx_'//file1

open(21,file=file1)
open(22,file=file11)
write(21,*)'have a good day!'
write(22,*) 'have a good day!'

close(21)
close(22)