On 02/05/2015 08:07 PM, Wang, Zeng-Sheng (TS-GSD-China-ZZ) wrote:
Dear Shawn,
Please forgive me for my poor English explanations of my question,
there are three files, file 1, file 2 and file3.
File 1:
a b c
d e f
j p k
file 2:
x y z
q w e n
a s d
file 3:
1 2 3
3 4 5
8 9 2 1
I read file 1 to $a, file 2 to $b and file 3 to $c, I want to product
file 4, it contain file 1 , file 2 and file 3.
as several people have said, don't use $a and $b for variables. even in
simple examples like this. seriously don't use them.
File 4:
a b c x y z 1 2 3
d e f q w e n 3 4 5
j p k a s d 8 9 2 1
it seems you want the first line of each file, then the 2nd and then the
third. this is easy. i won't code it for you but i will give you some
direction.
first, just read each file into an array of lines. you can do this in
several ways but you can work it out yourself first. we will help with
any problems but that is easy enough.
then remove the newlines of each line with chomp. it can do a whole
array for you in one call.
then get the first line of each array with shift and build up the first
line of the output. you can use the . op to append each line onto the
variable like this:
$out_line .= $line_from_file ;
then append a newline to that line. you don't need to output it to a
file to read it back in to $z.
do that for the other 3 lines. there are ways to do this with loops but
in your case stick with 3 copies of similar code. looping will likely
confuse you as you will need to know about arrays of arrays and such.
you seem to be a early beginner and aren't ready for perl data structures.
so code this up, test it out, debug it. when you are stuck next, post
the complete program and we can help more.
uri
