\documentclass[12pt]{article}
\usepackage{tikz}
\usepackage{pgf}
\usepackage{calc}
\usepackage[active,pdftex,tightpage]{preview}
\PreviewEnvironment[]{tikzpicture}


\begin{document}
       \begin{tikzpicture}[scale=1,very thick,>=stealth] %a very thick-et talan ki akarod majd venni. Van thin, thick, very thick, ultra thick, stb.
		\def\pointsize{0.06}

		\foreach \i in {-3,...,-1,1,2,3}{
			\draw[thin,dashed] (\i,-2) -- (\i,4);
			}
		\foreach \i in {-1,1,2,3}{
			\draw[thin,dashed] (-4,\i) -- (4,\i);
			}
		\draw[->] (-4,0) -- (4,0) node[pos=1,below] {Re};
		\draw[->] (0,-2) -- (0,4) node[pos=1,left] {Im};

		\draw (0,0) node[below left] {$0$};
		\draw (1,0) node[below,fill=white] {$1$};
		\draw (0,1) node[left,fill=white] {$\mathrm{i}$};

		\draw[fill=black] (3,2) circle (\pointsize) node[above right] {$3+2\mathrm{i}$};
        \end{tikzpicture}
\end{document}

