3 ms·

1 2 + 3 6 + 1 2 + / * ;)

• jesusabdullah 16y ago
  prefix, not postfix: (* (+ 1 2) (/ (+ 3 6) (+ 1 2))) I was also skeptical regarding the readability of prefix notation vs. postfix for large problems. However, when I tried it, I actually found it easier to handle. For example, here's a very obnoxious heat transfer correlation that I typed in common lisp: ( * 4.364 (expt (1+ (expt (/ Gz 29.6) 2)) 1/6) (expt (1+ (expt (/ (/ Gz 19.04) (* (expt (1+ (expt (/ *Pr* 0.0207) 2/3)) 1/2) (expt (1+ (expt (/ Gz 29.6) 2)) 1/3))) 3/2)) 1/3 )) Versus, in infix it's more like: 4.364 * (1. + (Gz/29.6)**2)**(1/6) * (1 + ( Gz/19.4/( (1 + (Pr/0.0207)**(2/3) )**(1/2) * (1 + (Gz/29.6)**2 )**(1/3) ))**(2/3) )**(1/3) Now, I admit that my sense of whitespace is pretty inconsistent, but still: Here is a real case of a very annoyingly nested expression in both infix and prefix notation. While I think it would take quite a while for anyone to sort out what the Hell is going on for either of these regardless of experience (versus, say, rendered LaTeX), I would put forth the suggestion that the common lisp is actually easier to understand.