What are _numeric_ and _character_ and what do they do?
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_numeric_ & _character_ are mostly used in:
1. Defining arrays: if an array is defined as _numeric_ that means it expects all values stored in it to be numeric ONLY! And if we define array as _character_ it expects only character values to be stored within it
2. With proc print, if we use these, it prints only numeric or only character variables of the data set!
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