How to

It has been awhile since I used c++. I am not asking for the solution but more of a how to start after int main. What I need to do is emulate the C operators.
Do you want to create a program working like this: input="1+2*3;" output="7" ?
If so, you might find useful this example: http://www.research.att.com/~bs/dc_command_line.c
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