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Previous Year Question (PYQs)

Consider the following postfix expression with single-digit operands:

$6\ 2\ 3\ *\ /\ 4\ 2\ *\ +\ 6\ 8\ *\ -$

The top two elements of the stack after the second $*$ is evaluated, are:





Solution

Given postfix expression is

$6\ 2\ 3\ *\ /\ 4\ 2\ *\ +\ 6\ 8\ *\ -$

First, push $6,2,3$ into stack.

After first $*$:

$2*3=6$

Stack becomes

$6,6$

Now, apply $/$:

$6/6=1$

Stack becomes

$1$

Now, push $4$ and $2$.

Stack becomes

$1,4,2$

Now, second $*$ is evaluated:

$4*2=8$

Stack becomes

$1,8$

So, the top two elements are

$8,1$


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