2. Write a program to achieve an expression, which verify the correctness of an arithmetic expression, if correct, the calculation of the arithmetic expression. Main features are described below: 1, from the keyboard input expression. 2, analysis of the expression is valid: (1) is a number, to determine the legality of the figure. If legal, is pushed into the data stack. (2) is to provide the operator, according to the rules for processing. In the process, the calculated value of the expression. (3) If the other characters, it returns an error message. 3, if the above process is not found error, that the legitimate expression, and prints the results.

third2
......\Debug
......\.....\third2.exe
......\.....\third2.ilk
......\.....\third2.obj
......\.....\third2.pch
......\.....\third2.pdb
......\.....\vc60.idb
......\.....\vc60.pdb
......\third2.cpp
......\third2.dsp
......\third2.dsw
......\third2.ncb
......\third2.opt
......\third2.plg

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