java复习与整理195

1. package demo02;
   
   public class Application {
       public static void main(String[] args) {
           /*  需求：世界最高峰珠穆朗玛峰为8848.43m = 8848430mm ，一张纸的厚度为0.1毫米，若纸无限大，
           则需要对折多少次能到达珠穆朗玛峰的高度？
            */
           Test s1 = new Test();
           s1.high();
       }
   }
   --------------------------------------------
   package demo02;
   
   public class Test {
       public void high(){
           int H = 88484300;   // 便于好算，扩大10倍
           int i = 1;
           int n = 0;
           while ( i < H){
               i = i*2;
               n++;
           }
           System.out.println("需要对折"+n+"次");
   
       }
   }
   ==========================================
   需要对折27次
   
   Process finished with exit code 0
   

2. package demo01;
   
   public class Application {
       //   遍历100到999的水仙花数
       public static void main(String[] args) {
           Test n1 = new Test();
           n1.calculate();
       }
   }
   --------------------------------------
   package demo01;
   
   public class Test {
       public void  calculate(){
           int n = 0;
           int m =0;
           for (int i = 152; i < 999 ; i++) {
               int a = i/100;     //  百位上的数字
               int b = i/10%10;   //  十位上的数字
               int c = i%10;      //  各位上的数字
               if ( i == a*a*a + b*b*b + c*c*c ){
                   n = i;
                   m++;
                   System.out.print(n+" ");
               }
   
           }
           System.out.println();
           System.out.println("水仙花数的个数为："+m);
       }
   }
   =====================================
   水仙花数的个数为：4
   
   Process finished with exit code 0