FactorialTest2

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import javax.swing.*;public class FactorialTest2 {public static void main(String args[]){int n;String s=(String)JOptionPane.showInputDialog(null,"请输入整数n","1到n的阶乘",      JOptionPane.PLAIN_MESSAGE,null,null,null); n=Integer.parseInt(s);{long i,j,k;for(i=1,j=1,k=1;j<=n;j++){k*=j;}System.out.println(n+"!="+k);}}}

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