I am trying to translate a piece of French material (in English) and here is my codes:
\documentclass[12pt]{article}
\usepackage[english]{babel}
\usepackage{amsmath,amsthm,amssymb,amsfonts}
\usepackage{geometry}\geometry{margin=1in}
\usepackage{paracol}
\begin{document}
\newpage
\begin{sloppypar}
\begin{paracol}{2}
1. Il y a plus de 50 ans que l'ingénieur Heaviside introduisit ses règles de calcul symbolique, dans un mémoire audacieux où des calculs mathématiques fort peu justifiés sont utilisés pour la solution de problèmes de physique.\\
\switchcolumn
\end{paracol}
\end{sloppypar}
\end{document}
But when I run the codes in TeXStudio, the accented letters completely disappear. (For instance, "ingénieur" in the first sentence becomes "ingnieur".)
Is there a quicker way to fix this than manully typing the accented letters as in this answer?

\usepackage[utf8]{inputenc}to your preamble, as suggested in the first answer in How to type special/accented letters in LaTeX? (that you link to). – Werner Nov 18 '16 at 19:51utf8is, I didn't try that one. Stupid me. Thanks for your comment. – Nov 18 '16 at 20:14:-)– Nov 18 '16 at 20:58