1. 程式人生 > >實訓09.08:簡單的演算法練習

實訓09.08:簡單的演算法練習

        /*final 關鍵字 修飾的變數值 後期不可更改 相當於定義常量
                常量 :不可更改
        */
        final int a = 10;
        //a = 20;       報錯的值不可更改!

        /*輸入函式
         * */
        System.out.println("請輸入數字:");
        Scanner  scanner = new Scanner(System.in);
        int b  = scanner.nextInt();     //需要一個變數來承接 
        System.out
.println(b); String name = scanner.next(); //字串 System.out.println("請輸入年份:"); int year = scanner.nextInt(); if((year % 4 == 0 && year %100 != 0) || year % 400 ==0) { System.out.println(year + "是閏年"); }else { System.out.println(year + "是平年"
); } System.out.println("請輸入月份:"); int moon = scanner.nextInt(); if(moon<0 || moon >12) { System.out.println("輸入錯誤!"); 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){ } //隨機數 Random系統的提供的類,用於獲取一個隨機自然數 //(大範圍 - 小範圍 + 1) + 小範圍 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("最大值為:" + max + ";最小值為 :"+min); //練習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("---------------------"); //練習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("---------------------"); //練習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("---------------------"); //練習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迴圈 //練習1 int money = 1000000000; int day = 0; while(money != 0) { money /=2; day ++; } System.out.println("一共花了" + day + "天"); } // 陣列 //eg : 32位元組 // 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(); //練習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]); } */ //練習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; } */ //練習3 int min = 100, minIndex = 0; //儲存下標 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 + "下標為: " + minIndex); System.out.println(max + "下標為:" + maxIndex); //二維陣列 本質有多個一維陣列組成 //二位陣列的length只能獲取行數 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("請輸入一個年份,謝謝合作!");
    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("請輸入一個月份");
        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,還想上天?");

        System.out.println("請輸入一個月份");

        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("請輸入年份:");
        a = sc.nextInt();

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

            System.out.println("請輸入一個月份");
            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("請輸入一個月份");
            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("請輸入人數:");
        int pp = wsq.nextInt();


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

            for(int j=0;j<pp;j++) {
                System.out.println("請輸入賬號:");
                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("請輸入密碼:");
                String mm = wsq.next();
                System.out.println("請再次輸入密碼:");
                String zmm = wsq.next();
                if(mm.equals(zmm)) {
                    System.out.println("很好!幹得漂亮!");
                    arr[pp][1] = zmm;
                    break;
                }else {
                    System.out.println("兩次密碼不一致!!!");
                }
            }




        }







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


    }

}