rpncalc

This is a RPN Calculator written in C.

Basics of RPN

Istead of writing one myself, I'm just gonna link to a tutorial.

The program

The program takes two types of input:

1. Numbers
2. Operations

• Add numbers to the stack by typing a number, and then enter.
• Do operations by pressing a numerical key.

Operators can do three things:

1. Operations between Buffer x and Buffer y
2. Operations on Buffer x
3. Manipulations of the stack

Example

2 + 5:
2 enter 5 enter a enter
Since all operations and number pushes are divided by an enter, it's usually written like this:
2 5 a

3 / -1:
3 1 c d

sqrt(9)^cos(3.4):
9 t 3.4 i p

Operators

• a: add
• s: subtrackt
• m: multiply
• d: divide
• c: change sign
• r: roll stack
• x: swap Buffer X and Buffer Y
• t: squareroot
• p: Buffer Y to the power of Buffer X
• u: cos
• i: sin
• o: tan
• q: quit the program