combined several column files and convert it into single row file

[yat]

i have a couple of column files, ex like

dat1.txt

98
87

dat2.txt

88

and so on (dat3.txt...datn.txt)

and i want to combine this column files to single row file like this (example like combine dat1.txt and dat2.txt)

98 87 88

Appreciate your help guys....

[dimsh]

cat dat*.txt | tr '\n' ' '

will result in a long line with no training new line "\n".