ex3_21.java

判断三角形

//3.21（求整数的因子）
import javax.swing.JOptionPane;
public class Ex3_21{
	public static void main (String[] args) {
      int number,factor=2;
      number=Integer.parseInt(JOptionPane.showInputDialog("请输入一个整数:"));
      if(number<=0){
      	JOptionPane.showMessageDialog("输入错误"+number);
      	System.exit(0);
      }
      System.out.println("该数的素数因子为：");
      while(factor<=number){
      	if(number%factor==0){
      		number=number/factor;
      		System.out.print(factor+", ");//输出各个因子
      	}
      	else
      		factor++;
      }
      System.exit(0);
   }
}