self doubt

Question

https://gateoverflow.in/849/gate2002-2-19

In case of with embedded function calls, we need stack of size >=2, not exactly two, bcoz the functions can be recursive also.

this is true ??or exaclty two is correct ?? i think >=2 is correct ..........what is correct answer??

Comments

Even if there is recursion one stack is sufficient to handle function calls and another is for expression evaluation.

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how ?? can u explain using a little example becz i am not getting the way while there is function inside function and we can only evaluate  any expression using stack if it is first converted into post fix

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Refer the example given by Saxena in that question.