Added calculator program
Added calculator program

psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,psushaanth23/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest