package org.test;
import java.util.Arrays;
import java.util.Scanner;
public class TestMain {static Scanner scanner = new Scanner(System.in );public static void test1 (){String left = "黑桃10" ;String right="红桃8" ;String temp = "" ;temp = left;left = right;right = temp;System.out .println("左边" +left);System.out .println("右边" +right);}public static void test2 (){System.out .println("请输入第一个数:" );int a = scanner.nextInt();System.out .println("请输入第二个数:" );int b = scanner.nextInt();System.out .println("请输入第三个数:" );int c = scanner.nextInt();int x=0 ;if (a>b){x=a;a=b;b=x;}if (a>c){x=a;a=c;c=x;}if (b>c){x=b;b=c;c=x;}System.out .println(a+"," +b+"," +c);}public static void test4 (){int sum=0 ;for (int i=2 ;i<=100 ;i+=2 ){sum+=i;}System.out .println(sum);}public static void test5 (){int i = 0 ;int sum = 0 ;while ( i<=100 ){i++;sum+=i;}System.out .println("总和是:" +sum);}public static void test6 (){int max = 0 ,min = 0 ,nums = 1 ,i = 0 ;System.out .println("请输入第1个数:" );nums = scanner.nextInt();max = nums;min = nums;for (i = 1 ;nums != 0 ;i++){System.out .println("请输入第" +(i+1 )+"个数:" );nums = scanner.nextInt();if (nums != 0 ){ if (nums > max){max = nums;}if (nums < min){min = nums;}}}System.out .println("最大值为:" +max);System.out .println("最小值为:" +min);
}public static void test7 (){int sum = 0 ;for (int i = 1 ; i <=100 ; i++) {if (i%2 ==0 ){continue ;}else {sum+=i;}}System.out .println("和是:" +sum);}public static void test8 (){int num = (int )(Math.random()*100 );System.out .println("随机数是:" +num);System.out .println("请猜数字:" );int cai = scanner.nextInt();int count = 1 ;do {if (cai>num){System.out .println("猜的太大了" );}else if (cai<num){System.out .println("猜的太小了" );}else {System.out .println("终于猜对了!" );break ;}count++;System.out .println("请猜数字:" );cai = scanner.nextInt();} while (cai!=num);System.out .println("猜的次数是:" +count);switch (count) {case 1 :System.out .println("你太聪明了!" );break ;case 2 :case 3 :case 4 :case 5 :System.out .println("不错,再接再厉!" );break ;default :System.out .println("太笨了" );break ;}}public static void test9 (){int num[] = new int [10 ];for (int i = 0 ; i < num.length; i++) {System.out .println("请输入第" +(i+1 )+"个数:" );num[i] = scanner.nextInt();}Arrays.sort(num);for (int i =num.length-1 ;i>=0 ;i--) {System.out .println(num[i]);}}public static void test10 (){int x=0 ; int y=0 ; for (x=0 ;x<=35 ;x++) { y=35 -x; if (2 *x+4 *y==94 ) System.out .println("鸡" +x+"只,兔" +y+"只" );}}public static void test11 (){System.out .println("请输入一个正整数:" );int num = scanner.nextInt();boolean flag = false ;if (num<=1 ){System.out .println("他不是素数!" );}else {for (int i = 2 ; i < num; i++) {if (num%i==0 ){flag = true ;}}if (flag==true ){System.out .println(num+"不是素数" );}else {System.out .println(num+"是素数" );}}}public static void test12 (){int a = 2 ,b= 1 ,c= 0 ,sum=0 ;for (int i = 1 ; i <=20 ; i++) {sum = a/b; c = a+b;b = a;a = c;}System.out .println("和为\t" +sum);}public static void main (String[] args) {test12();}}