The following postfix expression with single digit operands is evaluated using a stack:
$$8 \ 2 \ 3 \ ^\hat{} / \ 2 \ 3 * + 5 \ 1 * -$$
Note that $^\hat{}$ is the exponentiation operator. The top two elements of the stack after the first $*$ is evaluated are
- $6, 1$
- $5, 7$
- $3, 2$
- $1, 5$