?? ex2_5.java
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import javax.swing.JOptionPane;public class EX2_5 { public static void main(String[] args) { double cost, rate, debut, total; cost = Double.parseDouble(JOptionPane.showInputDialog("費用：")); rate = Double.parseDouble(JOptionPane.showInputDialog("提成率：")); debut = cost * rate; total = cost + debut; String result = "提成：" + debut + "\n" + "總費用：" + total; JOptionPane.showMessageDialog(null, result); }}?? 快捷鍵說明
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