#135
Infix Calculator
| Difficulty: | Easy |
| Topics: | higher-order-functions math |
Your friend Joe is always whining about Lisps using the prefix
notation for math. Show him how you could easily write a function that does math
using the infix notation. Is your favorite language that flexible, Joe? Write a
function that accepts a variable length mathematical expression consisting of
numbers and the operations +, -, *, and /. Assume a simple calculator that does
not do precedence and instead just calculates left to right.
 | (= 7 (__ 2 + 5)) |
| (= 42 (__ 38 + 48 - 2 / 2)) |
| (= 8 (__ 10 / 2 - 1 * 2)) |
| (= 72 (__ 20 / 2 + 2 + 4 + 8 - 6 - 10 * 9)) |