1.编写程序, 输入变量x的值,如果是1,输出x=1,如果是5,输出x=5,如果是 10,输出 x=10,除了以上几个值,都输出x=none。(知识点:if条件语句)
package sjfour; import java.util.Scanner; public class one { public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc= new Scanner(System.in); System.out.println("请输入x的值"); int x=sc.nextInt(); if(x==1 || x==5 || x==10) { System.out.println("x="+x); }else { System.out.println("x=none"); } } }
2.用switch结构实现第1题
package sjfour; import java.util.Scanner; public class two { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("请输入x的值"); int x=sc.nextInt(); switch(x) { case 1: case 5: case 10:System.out.println("x="+x);break; default:System.out.println("x=none"); } } }
3.判断一个数字是否能被5和6同时整除(打印能被5和6整除),或只能被5整除(打印能被5整 除),或只能被6整除,(打印能被6整除),不能被5或6整除,(打印不能被5或6整除)
package sjfour; import java.util.Scanner; public class three { public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc=new Scanner(System.in); System.out.print("请输入数字:"); int x=sc.nextInt(); if(x%5==0&&x%6==0){ System.out.println(x+"能被5和6整除"); }else if(x%5==0){ System.out.println(x+"能被5整除"); }else if(x%6==0){ System.out.println(x+"能被整除"); }else{ System.out.println(x+"不能被5或6整除"); } sc.close(); } }
4.输入一个0~100的分数,如果不是0~100之间,打印分数无效,根据分数等级打印 A(90-100),B(80-89),C,D,E(知识点:条件语句if elseif)
package sjfour; import java.util.Scanner; public class four { public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc=new Scanner(System.in); System.out.print("输入分数:"); int a=sc.nextInt(); if(a>=90&&a<=100){ System.out.println("等级为A"); }else if(a>=80&&a<=89){ System.out.println("等级为B"); }else if(a>=70&&a<=79){ System.out.println("等级为C"); }else if(a>=60&&a<=69){ System.out.println("等级为D"); }else if(a>=50&&a<=59){ System.out.println("等级为E"); }else{ System.out.println("分数无效"); } } }
5.输入三个整数x,y,z,请把这三个数由小到大输出(知识点:条件语句)