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I want to use the expression enter by the user and form the Tree, so I did TreeForm[test] as the picture show but it's not working. But if I do it manually, it works. enter image description here

Can anyone explain to me why this happens and how can I fix it?

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  • $\begingroup$ try TreeForm[ToExpression @ test] ? $\endgroup$ Commented Dec 9, 2020 at 7:00
  • $\begingroup$ OMG, you're such a genius! Thank you so much! Problem solved. $\endgroup$ Commented Dec 9, 2020 at 7:11

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TreeForm[ToExpression @ test] Thanks to @kglr

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