ch6_e6_19.java

《java语言与面向对象程序设计题解及实验指导》源代码

public class ch6_e6_19
{ 
    public static void main(String args[])
    {
        if(args.length<2)
        {
            System.out.println("运行本程序应该提供两个整型命令行参数"
                + "例如：\n java ch6_e6_19 1 1000");
            System.exit(0);
        }
        try
        {
            int floor,ceiling,temp,count=0;
            
            floor = Integer.parseInt(args[0]);
            ceiling = Integer.parseInt(args[1]);
            if(floor > ceiling)
            {
                temp = floor;
                floor = ceiling;
                ceiling = temp;
            }
            
            for(int i=floor; i<ceiling; i++)
            {
                int y=0;
                
                for(int j=1; j<i; j++)
                {
                    if( i%j == 0)
                        y += j;
                }
                if( y == i )
                {
                    System.out.print( i + "\t" );
                    count++;
                    if( count%6 == 0)
                        System.out.println();
                }
            }
            
        }
        catch(NumberFormatException nfe)
        {
            System.out.println(nfe.toString());
            System.out.println("命令行参数应为整型，例如"
                + "\n java ch6_e6_19 1 1000");
        }
    }
}