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Infix Expression to Prefix-Expression

Posted on 1997-11-23
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Last Modified: 2008-03-06
I want a C++ code which convert an infix-expression (String1) into a pre-fix-expression (String2).
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Question by:matchz
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by:mitchell042997
ID: 1173984
Could you be a little clearer?  Defining what you mean by infix and prefix would be helpful.  Thanks!
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by:matchz
ID: 1173985
Sorry, That's:
Infix Expression : a * b + c
=> Prefix Expression : + c * a b
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mitchell042997 earned 70 total points
ID: 1173986
Basically, what you're going to want to do is create an expression tree.  So, in your example above, your tree would look like:

    +
   / \
  c   *
     / \
    a   b

Then, if you did a preorder traversal, it would return +c*ab, an inorder traversal would return c+a*b and a postorder traversal would return cab*+.

I am assuming you've have some knowledge about trees.  If this in incorrect, let me know, and I can provide source code and further examples.
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by:matchz
ID: 1173987
Thanks a lot.
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