>file
this redirects the output into a file.
but if the out of the line is more then, the extra length will not be visible in the 'file'. so to see the extra lenth of a line in a new line u give...

you can do in two ways.
1. write a shell script so that u need to just run the script

cat rm.sh

#!\bin\sh
for i in `cat input.txt`
do
rm $i
done

float mean(const double, int, int);
this is ur declaration, here the first argument is only double and not a array or pointer.
but in the function you are using this as if it is array....