java获取四位数的吸血鬼数字_mannix_lei的博客

public class Vampire {
    public static void main(String []args){
        long start = 0;
        long end = 0;
        start = System.currentTimeMillis();
        for(int i = 1000;i<9999;i++){
            int a = i/1000;
            int b = i/100 - a*10;
            int c = i/10 -a*100 -b*10;
            int d = i - a*1000 - b*100 - c*10;
            if((c+d)!=0) {
                if((b*10+a)*(c*10+d)==i){
                    System.out.println(i + "=" + b + a + "*" + c +d);
                }
                if((c*10+a)*(b*10+d)==i){
                    System.out.println(i+ "=" + c + a + "*" + b +d);
                }
                if((a*10+d)*(c*10+b)==i){
                    System.out.println(i+ "=" + a + d + "*" + c +b);
                }
            }
        }
        end = System.currentTimeMillis();
        System.out.println("总共历时"+ (end-start)+ "ms");
    }
}public class Vampire {
    public static void m