实训09.08：简单的算法练习

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_41264055/article/details/82633246

        /*final 关键字 修饰的变量值 后期不可更改 相当于定义常量
                常量 ：不可更改
        */
        final int a = 10;
        //a = 20;       报错的值不可更改！

        /*输入函数
         * */
        System.out.println("请输入数字：");
        Scanner  scanner = new Scanner(System.in);
        int b  = scanner.nextInt();     //需要一个变量来承接 
        System.out.println(b);

        String name = scanner.next();       //字符串

        System.out.println("请输入年份：");
        int year = scanner.nextInt();
        if((year % 4 == 0 && year %100 != 0) || year % 400 ==0) {
            System.out.println(year + "是闰年");
        }else {
            System.out.println(year + "是平年");
        }
        System.out.println("请输入月份：");
        int moon = scanner.nextInt();
        if(moon<0 || moon >12) {
            System.out.println("输入错误！");
            return;
        }else if(moon == 1 || moon ==3 || moon == 5 ||moon == 7 || moon ==8|| moon ==10 || moon ==12) {
            System.out.println(moon + "月有31天");
        }else if (moon){

        }








    //随机数   Random系统的提供的类，用于获取一个随机自然数
        //（大范围 - 小范围 + 1） + 小范围
        Random  random = new Random();
//      int num = random.nextInt(100);      0 ~ 100
//      int num = random.nextInt() % 100;       -99 ~ 99
        int num = random.nextInt(40 - 20 + 1)  + 20;
        System.out.println(num);

//      for(int i = 1;i <= 100; i++) {
//          if(i % 2 != 0) {
//              System.out.println(i);
//          }
//      }

//      int sum = 0;
//      for (int i = 1; i <= 100; i++) {
//          sum += i;
//      }
//      System.out.println(sum);

//      for(int i = 0;i <= 100; i++) {
//          if(i % 7 == 0) {
//              System.out.println(i);
//          }
//      }


//      for (int i = 1;i <= 100;i++) {
//          if(i % 10 == 7 ) {
//              System.out.println(i);
//          }
//      }

//      for (int i = 1;i <= 100; i++) {
//           if(i /10 == 7) {
//               System.out.println(i);
//           }
//      }

//      for (int i = 1;i<= 100;i++) {
//          if(i / 7 != 0 && i % 10 != 7) {
//              System.out.println(i);
//          }
//      }

        int min = 100, max = 0;
        for(int i = 1 ;i <= 10;i++) {
//          int num2 = random.nextInt(80 - 30 + 1)  + 30;
            int temp =  random.nextInt(51) + 30;
            if(temp > max) {
                max = temp;
            }  if(temp < min) {
                min = temp;
            }
            System.out.print(temp + "    ");
        }
        System.out.println("最大值为：" + max  + "；最小值为 ："+min);


        //练习1
        for(int i = 1;i < 4;i ++) {
            for(int j = 1 ;j <= i +1; j++) {
                System.out.print(j + "      ");
            }
            System.out.println();
        }       
        System.out.println("---------------------");

        //练习2
        for(int i = 0 ;i < 4; i++) {
            for(int j =1; j <= 4 - i; j++) {
                System.out.print(j + "      ");
            }
            System.out.println();

        }
        System.out.println("---------------------");


        //练习3
        for(int i = 0;i < 4;i++) {
            for(int j = 4; j >= i + 1; j--) {
                System.out.print(j + "   ");
            }
            System.out.println();
        }
        System.out.println("---------------------");    

        //练习4
        for(int i = 1;i <= 9; i++) {
            for(int j = 1; j <= i; j ++) {
                System.out.print(j + " * " + i + " = " + i * j);
            }
            System.out.println();
        }


        //while循环
        //练习1
        int  money = 1000000000;
        int day = 0;
        while(money != 0) {
            money /=2;
            day ++;
        }
    System.out.println("一共花了" + day  + "天");
    }











    // 数组
        //eg : 32字节
//      int[]  a1 = {11, 22, 44, 33, 55, 77, 66};
//      a1[0] = 100;
//      int[] a2 = new int [10];    //0 0 0 0 0 0 0 0 0 0 
//      
//      
//      for(int i = 0;i < a1.length;i++) {
//          System.out.println(a1[i]  + "     ");
//      }
//      Randon random= new Random();

        //练习1
        Random random = new Random();
/*      int[]  a1 =  new int[10];
        int[] a2 = new int [10];        

        for(int i = 0 ;i < 10; i++) {   
            a1[i] = random.nextInt(41) + 30;
            a2[i] = a1[i];
            System.out.println(a1[i]  + "     "  + a2[i]);
        }
*/

        //练习2
/*      int[] arr1 = new int[5];
        int[] arr2 = new int[5];
        int[] arr = new int[10];
        for(int i = 0 ;i < 5; i ++) {
            arr1[i] = random.nextInt(41) +50;
        }
*/

        //练习3
        int min = 100, minIndex = 0;    //存储下标
        int max = 0,maxIndex = 0;
        int[] array1 = new int [10];
        for(int i =0; i < 10;i ++) {
            array1[i] = random.nextInt(41) +  10;
            if(array1[i] < min) {
                minIndex = i;
                min = array1[i] ;
            } if(array1[i] > max) {
                maxIndex = i;
                max = array1[i];
            }
            System.out.print(array1[i] + "       ");

        }   
        System.out.println();
        System.out.println(min + "下标为: " + minIndex);
        System.out.println(max + "下标为:" + maxIndex);

        //二维数组  本质有多个一维数组组成
        //二位数组的length只能获取行数
        int[][] m = {
                {1,2,3,4},
                {11,22,33,44},
                {111,222,333,444}
        };
        System.out.println(m[1][3]);

package yb;

import java.util.Scanner;

public class beyond {

    public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    System.out.println("请输入一个年份，谢谢合作！");
    int wsq= sc.nextInt();
    if((wsq%4==0 && wsq%100 !=0)   ||   wsq%400 ==0) {

        System.out.println("好了，你可以上天了。");

        System.out.println("请输入一个月份");
        int yy = sc.nextInt();
        if(yy==1 || yy==3 || yy==5 || yy==7 || yy==8 || yy==10 || yy==12) {
            System.out.println("31天");
        }else if(yy==2) {
            System.out.println("30天");
        }else {
            System.out.println("28天");
        }

    }else {

        System.out.println("就你，还想上天？");

        System.out.println("请输入一个月份");

        int yy = sc.nextInt();
        if(yy==1 || yy==3 || yy==5 || yy==7 || yy==8 || yy==10 || yy==12) {
            System.out.println("31天");
        }else if(yy==2) {
            System.out.println("30天");
        }else {
            System.out.println("29天");
        }
    }



  }











package yb;

import java.util.Random;

public class CircleFor {

    public static void main(String[] args) {
        // Random

        /*
         * Random random = new Random(); int a = random.nextInt(41)+30;
         */

        // System.out.println(a);

        /*
         * for(int i=1; i<=100;i=i+2) { System.out.println(i); }
         */
        /*
         * int sum = 0; for (int i = 1; i <= 100; i++) { sum = sum + i; }
         * 
         * System.out.println(sum);
         * 
         * for (int j = 1; j <= 100; j++) { if (j % 7 == 0) System.out.print(j + " "); }
         * System.out.println();
         * 
         * for (int j = 1; j <= 100; j++) { if (j % 10 == 7) System.out.print(j + " ");
         * } System.out.println();
         * 
         * for (int k = 1; k <= 100; k++) { if (k / 10 == 7) System.out.print(k + " ");
         * } System.out.println();
         * 
         * for (int o = 1; o <= 100; o++) { if ((o % 10 != 7) && (o % 10 != 7) && (o /
         * 10 != 7)) System.out.print(o + " "); } System.out.println();
         * 
         * int x[] = new int[10]; Random random = new Random();
         * 
         * for (int y = 0; y < 10; y++) { x[y] = random.nextInt(51) + 30; }
         * 
         * for (int i = 0; i < 10; i++) { for (int j = 0; j < 10 - i; j++) { if (x[j] >
         * x[j + 1]) { int t = x[j]; x[j] = x[j + 1]; x[j + 1] = t; } } }
         * 
         * for(int j =0;j<10;j++) { System.out.println(x[j]); }
         * 
         * int max = 0, min = 10; for (int i = 1; i <= 100; i++) { int q =
         * random.nextInt(51) + 30; if (q > max) max = q; if (q < min) min = q; }
         * System.out.println(max + " " + min);
         */

        for (int i = 1; i <= 4; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + " ");
            }
            System.out.println();
        }

        System.out
                .println("-------------------------------------------------------------------------------------------");

        for (int j = 4; j >= 1; j--) {
            for (int k = 1; k <= j; k++) {
                System.out.print(k + " ");
            }
            System.out.println();
        }

        System.out.println(
                "--------------------------------------------------------------------------------------------");

        for (int i = 4; i >= 1; i--) {
            for (int k = 4; k >= i; k--) {
                System.out.print(k + " ");
            }
            System.out.println();
        }

        System.out.println(
                "--------------------------------------------------------------------------------------------");

        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(i + "*" + j + "=" + j * i + " ");
            }
            System.out.println();
        }
        System.out.println(
                "--------------------------------------------------------------------------------------------");

        int y = 0;
        double p = 1000000000;
        while (p > 0) {
            p = p / 2;
            y++;
        }
        System.out.println(y);

    }

}


}

package yb;

import java.util.Scanner;

public class days {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a,b,c,i,j;
        int sum1=0,sum2=0;
        int [] y = {0,31,28,31,30,31,30,31,31,30,31,30,31};
        int [] u = {0,31,29,31,30,31,30,31,31,30,31,30,31};
        System.out.println("请输入年份：");
        a = sc.nextInt();

        if((a%4==0 && a%100 !=0) || a%400 ==0) {

            System.out.println("请输入一个月份");
            b = sc.nextInt();

            System.out.println("請輸入一天數");
            c = sc.nextInt();

            for(i=1;i<=b;i++) {
              sum1 = sum1 + y[i];
            }
            System.out.println(sum1+c);


        }else {

            System.out.println("请输入一个月份");
            b = sc.nextInt();

            System.out.println("請輸入一天數");
            c = sc.nextInt();

            for(i=1;i<=b;i++) {
              sum1 = sum1 + u[i];
            }
            System.out.println(sum1+c);

    }

}
    }

package java02;

import java.util.Scanner;

public class section {

    public static void main(String[] args) {

        String [][] arr = new String [100][2];
        Scanner wsq= new Scanner(System.in);

        System.out.println("请输入人数：");
        int pp = wsq.nextInt();


        for(int i=0;i<pp;i++) {

            for(int j=0;j<pp;j++) {
                System.out.println("请输入账号:");
                String zh = wsq.next();
                arr[i][0] = zh;
                if(arr[i][0].equals(arr[i+1][0]))
                    j--;
                else 
                    break;
            }




            boolean yy = true;

            while(yy) {
                System.out.println("请输入密码：");
                String mm = wsq.next();
                System.out.println("请再次输入密码：");
                String zmm = wsq.next();
                if(mm.equals(zmm)) {
                    System.out.println("很好！干得漂亮！");
                    arr[pp][1] = zmm;
                    break;
                }else {
                    System.out.println("两次密码不一致！！！");
                }
            }




        }







        for(int i=0 ; i<pp;i++) {
            for(int j=0;j<2;j++) {
                System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }


    }

}