Added Calculator class#5

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NeelaMukherjee wants to merge 8 commits intoZipCodeCore:masterfrom

NeelaMukherjee:branch1

Commits on Feb 10, 2019

First test
Francisco-Castro
committed
My 3th commit
Francisco-Castro
committed
Merge pull request #1 from zipcodeFrancisco/francisco
NeelaMukherjee
authored
Added Calculator class

Neelanjana Mukherjee
authored and
Neelanjana Mukherjee
committed
Merge branch 'master' into branch1
NeelaMukherjee
authored
Merge pull request #2 from NeelaMukherjee/branch1
NeelaMukherjee
authored
changed tester class

Neelanjana Mukherjee
authored and
Neelanjana Mukherjee
committed
Added IO class

Neelanjana Mukherjee
authored and
Neelanjana Mukherjee
committed