[Tex/LaTex] Centering chapter/section/subsection and font size

Question

\documentclass[12pt]{report}

\usepackage{setspace}
\usepackage{geometry}           
\geometry{letterpaper, left=1.25in, right=1.0 in, top=1.0in, bottom=1.0in, includefoot}
\usepackage{amsmath, amsfonts, amssymb, amstext, amscd, amsthm, makeidx, graphicx, hyperref, url, enumerate, listings,multicol,capt-of,float, amsthm}
\usepackage{titletoc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{sectsty}
\usepackage[tiny]{titlesec}
\usepackage{indentfirst}
\allowdisplaybreaks
\newcommand{\doublesize}{\normalsize\fontsize{12pt}{25pt}\selectfont}
\allsectionsfont{\centering}


\chapter*{ACKNOWLEDGMENTS}
\addcontentsline{toc}{chapter}{\centering ACKNOWLEDGMENTS }

I've tried using \centering and \sectsty but neither work with titlesec. Help please!

Answer 1

Use either sectsty or titlesec to change the layout of the section headings. Here is a suggestion using sectsty.

\documentclass[12pt]{report}
\usepackage{geometry}           
\geometry{letterpaper, left=1.25in, right=1.0 in, top=1.0in, bottom=1.0in, includefoot}

\usepackage[T1]{fontenc}
\usepackage{indentfirst}

\usepackage{sectsty}

\allsectionsfont{\nohang\centering\normalsize}
\chaptertitlefont{\nohang\centering\large}

\usepackage{blindtext}% dummy text
\begin{document}
\tableofcontents
\blinddocument
\end{document}