Comments should be used generously in the source code to make it readable.
Comments are categorized in two following ways:
1) Begin with /* and end with */
Every statement between /* and */ will be considered as comment.
2) Begin with // and with the next line character
It comments entire line begin with //
E.g.
Note: - Comments cannot be nested.
For example, /* Cal of SI /* Author John date 03/03/2013 */ */ is invalid.