I am trying to write a tex file in Kile with font \textt.
This font looks like following typing in a book Number fields-Marcus.
But when after \begin{document} I wrote \tt or \texttt, the text was exceeding line in the pdf file; in other words, it was showing some warning.
How can I settle the \texttt font in Kile?

\ttfamily\raggedrightafter\begin{document}.