[Tex/LaTex] spacing after \paragraph in a document

sections-paragraphsspacing

I want to put a space between the paragraph header and the paragraph itself. But all I have tried so far, didn't work. Using \paragraph the header and the body are in the same line, whereas I want to skip at least a line between the header and the body of paragraph.

\documentclass[oneside,12pt]{book}     
\usepackage[french]{babel} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc} 
\begin{document}

\section{section}
\subsection{subsection}
\subsubsection{subsubsection}
\paragraph{the header}
\vspace{1cm} % I want to skip a line or add space between header and the body of paragraph
body of the paragraph

\end{document}

I am using a book document, for all the answers I have seen so far are for article document or for scrbook document.

Best Answer

In general, \paragraph style was fixed in book.cls as no below space with text runon with the heads, if you need below space then follow the below tag:

\documentclass[oneside,12pt]{book}     
\usepackage[french]{babel} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc} 
\begin{document}
\makeatletter
\renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}%
                                    {-3.25ex \@plus1ex \@minus.2ex}%
                                    {10pt}%
                                    {\normalfont\normalsize\bfseries}}
\makeatother

\section{section}
Test
\subsection{subsection}
Test
\subsubsection{subsubsection}
Test
\paragraph{the header}
body of the paragraph

\end{document}
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