Put a Table/Figure/Equation at the right position

 

Just add h after begin tag. As simple as it is. H here means

Place the float here, i.e., at the same point it occurs in the source text.

   begin{table}[h]
    center
      begin{tabular}{|l|l|}
 
        hline
        multicolumn{2}{|c|}{Schedule of This Week} 
        hline
        Monday & SigNEW
        Tuesday & Artificial Intelligence, Compiler 
        Wednesday & Research Meeting 
        Thursday & Artificial Intelligence, Compiler 
        Friday & Research 
        hline
      end{tabular}
 
        caption{Complex Table}
        label{tab:complex}
    end{table}

Here are two good resources 1 and 2.

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Category >> Latex  
If you want someone to read your code, please put the code inside <pre><code> and </code></pre> tags. For example: 
<pre><code> 
String foo = "bar";
</code></pre>