This is a java program to implement an RPN (Reverse Polish Notation) scientific calculator that will support the following operators:

+ - * / -> pop 2, push 1

^ power, e.g. 2^3 -> pop 2, push 1

! factorial > pop 1, push 1

sin cos tan trig > pop 1, push 1

asin acos atan arc-trig > pop 1, push 1

log ln log functions > pop 1, push 1

sqrt square root > pop 1, push 1

rand random number -> push 1

pi constant: 3.141 -> push 1

e constant: 2.718 -> push 1