By defining as variant, I can copy a range of cells data  (in integer
or long  data type) from excel sheet in the variant variable  by single
command (saves computational time).

Later, I wanted to use this variable defined as variant in data type
integer as all my data is integer. Reason:
1. I need to pass this variant variable data to a subroutine which
accepts parameters of type  long.
2. It can save data storage space.