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however I'm not allowed to use classes, pointers, or structs

yes that is exactly how I want it to output. How do I set up a stack for it to work though?

My current program takes user input for an expression tree, example *2x and outputs

* 0 0
2 0 0
x 0 0

*2x is stored in a string.
the 2nd and 3rd columns represent a left-child right-child...

As of now my program as the user input an expression like *2x and then the program outputs it as

*
2
x

I am wanting to display zeros next to the elements, 2 columns of zeros so the output...

As of now my program as the user input an expression like *2x and then the program outputs it as

*
2
x

I am wanting to display zeros next to the elements, 2 columns of zeros so the output...

ok so how would I then output the elements the user inputs into the left column. Do I need a for loop or how would do I need to go about it?

I need to have the program take a user's input in prefix notation and display it in a left child-right child array representation of a tree.

Ex: input: *2x
output:
...