Evaluate the following postfix expressions by using the algorithm we discussed in the videos$/$pdfs$.$ Show the status of the stack after each step of the algorithm. Use the following values: a$=7,$ b$=3,$ c$=12,$ d$=-5,$ e$=1$:

a b c $+-$

a b c $-$ d $*+$

Convert the following infix expressions to postfix form by using the algorithm we discussed in the videos$/$pdfs$.$ Show the status of the stack and postfixExp after each step of the algorithm.

a $-$ b $+$ c

a $-($b $/$ c $*$ d$)$