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Problem # 14 : Expression Evalutaion
Write a function CALC(A$) which takes a mathematical expression and
calculates it.
The expression will be given as a string
A$. For example A$="(10-5*(7+3))"
Sample Output
CALC("10-5*(7+3)") should return : -40
CALC("15.5-9.8*(2.3+3.7)-56/2+4") should return : -67.3
CALC("17.5+4.3*(2.4+5.33)") should return : 50.739
HINT : Convert the expression into post-fix form and then calculate
it.
This will amount to creating a reverse polish notation calculator.
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