Please complete the Calculator.
Requirements:
1, Make it support negative values
2, Make it support ()
3, The calculator pop up a message box when the expression is invalid
4, The calculator gets the correct result and never crashes or freezes.
Thanks!
JT
Requirements:
1, Make it support negative values
2, Make it support ()
3, The calculator pop up a message box when the expression is invalid
4, The calculator gets the correct result and never crashes or freezes.
Thanks!
JT
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