The calculator should store the result of an expression in a variable called "ans", which can be
used as an input in other mathematical expressions, as shown in the following statements:
>calculate 25*(3+5-(10/2))
ans=75
>calculate ans+10
ans=85
>calculate ans*10/5
However, the candidate can declare any variable to store the result. Being an aspiring candidate,
develop the console-based calculator using C#.

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