Javascript RPN Scientific Calculator
Reverse Polish notation (RPN) is a mathematical notation in which the operator follows the operands. In RPN, instead of writing an expression like "3 + 4", you would write it as "3 4 +". RPN is also known as postfix notation.
Here's an example of how RPN works:
Suppose we want to evaluate the expression (2 + 3) * 4 using RPN. Here's how we would do it:
Write the numbers in the order they appear: 2 3 4
Write the operators in the order they appear, after the numbers: + *
Start with the first two numbers and apply the first operator: 2 + 3 = 5
Replace the two numbers and the operator with the result: 5 4
Apply the second operator to the remaining numbers: 5 * 4 = 20
So the value of the expression (2 + 3) * 4 in RPN is 20.
RPN is commonly used in computer programming and calculators because it is easy to implement using a stack data structure. When using RPN in a calculator, the user enters the numbers and operators in RPN form, and the calculator evaluates the expression as the user enters it, without needing to use parentheses or remember operator precedence rules.
