I am well aware that this code is terrible. I just did it to try different Swing stuff. This is an interesting problem. This creates 4 buttons for adding, subtracting, dividing and multiplying. Multiplying and adding jobs is fine, no problem at all, but when the user tries to subtract, he always returns 0. When the user tries to split it, he always returns 1 or 1.0 depending on the input. I can not understand. Here is the code:
(ns rayne.main
(:gen-class)
(:import (javax.swing JFrame JTextField JButton JOptionPane)
(java.awt.event ActionListener)
(java.awt GridLayout)))
(def numbers (ref []))
(def times-clicked (ref 0))
(defn calc [nseq op]
(let [n1 (first nseq)
n2 (last nseq)]
(cond
(= op "+") (+ n1 n2)
(= op "*") (* n1 n2)
(= op "-") (- n2 n1)
(= op "/") (/ n1 n2))))
(defn add-op-button [op text button]
(.addActionListener button
(proxy [ActionListener] []
(actionPerformed [e]
(dosync
(ref-set times-clicked (inc @times-clicked))
(if (= @times-clicked 2)
(do
(let [result (.toString (calc @numbers op))
result2 (read-string result)]
(.setText text result)
(ref-set numbers [])
(ref-set times-clicked 0)))
(do
(ref-set numbers (conj @numbers (read-string (.getText text))))
(.setText text ""))))))))
(defn -main []
(let [frame (JFrame. "Calculator")
add-button (JButton. "+")
sub-button (JButton. "-")
mul-button (JButton. "*")
div-button (JButton. "/")
clr-button (JButton. "Clear")
text-field (JTextField.)]
(add-op-button "+" text-field add-button)
(add-op-button "-" text-field sub-button)
(add-op-button "*" text-field mul-button)
(add-op-button "/" text-field div-button)
(doto frame
(.setLayout (GridLayout. 1 5))
(.add text-field)
(.add add-button)
(.add sub-button)
(.add mul-button)
(.add div-button)
(.setSize 500 100)
(.setVisible true))))
The indentation is probably screwed up due to copying and formatting on the fly, but there is one. Once again, I know the code is terrible.
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