Postfix and prefix calculators are not present

[shashank-vats]

Algorithms to calculate postfix and prefix expression are not present. I wish to work on this.

[cclauss]

Please do not wait for permission. Just go ahead and submit pull requests for review.

[mursalfk]

Okay... thanks @cclauss

[Rameshwar3297]

I want to work on this algorithms. I can add algorithms to calculate postfix and prefix expression. Can i do ?? @