Create cal.java

[Akritiiiiiiii]

a simple calculator program in Java that performs addition, subtraction, multiplication, and division based on user input.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.93%. Comparing base (c06dc29) to head (b8a8a5b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6702   +/-   ##
=========================================
  Coverage     75.93%   75.93%           
- Complexity     5845     5846    +1     
=========================================
  Files           707      707           
  Lines         19965    19965           
  Branches       3871     3871           
=========================================
  Hits          15161    15161           
  Misses         4219     4219           
  Partials        585      585           

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