Convert decimal to integer in Visual TeX IDE

Question

I want to convert decimal number to integer in latex program with Visual Tex IDE. I found this function \pgfmathparse{ceil(2.7)} which requires installing the package pgfmath and pgfkeys. And after conversion I need to add two numbers. I tried using \numexpr (for integers) and \dimexpr (for decimals). But both functions simply concatenate those two values.

I don't know how to install packages in Visual Tex. Could someone suggest me how to install a package in Visual TeX. Or Could someone suggest me if there is any other function in calc package through which I can get ceil.

\documentclass{article}%
\usepackage{calc}%
\begin{document}%
\newcommand{\addnum}[2] {%
  \def\numa{#1}
  \def\numb{#2}
  \def\deca{#3}
  \def\decb{#4}
  Int Sum is \numexpr\numa+\numb\relax
  Dec Sum is \dimexpr\deca+\decb\relax
}%%
\addnum{10}{20}{30.45}{55.63}%
\end{document}%

It gives below output:

Int Sum is 10+20 Dec Sum is 30.45+55.63

This program works in MiKTeX. But I want it to work on Visual Tex IDE. I set the output mode as PDF.

I'm not familiar with 'Visual TeX IDE': can you provide a link? — Joseph Wright, May 12 '15 at 18:18
Below links have information regarding Visual Tex(VTEX) IDE: http://www.micropress-inc.com/texdocs/enide.htm http://www.micropress-inc.com/ — Monica, May 12 '15 at 19:12
Ah: VTeX. We had this come up recently. VTeX hasn't been updated for about 10 years and doesn't have the e-TeX extensions, which provide for example \numexpr. — Joseph Wright, May 12 '15 at 19:23
See for example http://tex.stackexchange.com/questions/239560/undefined-control-sequence-in-vtex, where someone else seemed to run into much the same issue. — Joseph Wright, May 12 '15 at 19:30
You get either the error message Undefined control sequence or You can't use\numexpr' in vertical mode`. — egreg, May 12 '15 at 19:34
@SeanAllred Yes, since e-TeX was finalised in 1999 we do require it. — Joseph Wright, May 12 '15 at 19:34

Convert decimal to integer in Visual TeX IDE

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