I don't use a scientific calculator anymore because app versions are more convenient. HiPER Calc has all the basic scientific functions that you'll find on a Sharp or Casio model such as trigonometric functions, square root, exponential operations (squares and higher powers of values), log functions, base conversion, statistical functions etc. It also has a multiline display so you can see the formulas/operands that you're typing, plus "backspace" and cursor controls for editing entered data. It can graph functions of single and double variables (surfaces) and work out definite and indefinite integrals. I'm using it here to calculate the log of a value.
HiPER Calc can work in two different modes:
Immediate-execution (RPN/postfix-style): you enter the number first, then press the function.
2 → √ gives √2.
30 → cos gives cos 30°.
Algebraic/infix mode: you press the function first, then enter its argument.
√ → 2 gives √2.
cos → 30 gives cos 30°.
Sometimes it's more convenient to work in immediate mode so you can do some calculations and then carry out an operation on the result, like squaring it.
