Table: column-type repetition

I am sure you know the situation where you have several columns in a tabular which all are of the same type:

\begin{tabular}{|r|c|c|c|c|c|}

Now this can be simplified as follows using the *(star) symbol:

\begin{tabular}{|r*{5}{|c}|}

The advantages are obvious, the table can be easily extended, you don’t have to count the numerous c’s, l’s or r’s and it saves you time.