第一题: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)
1 package test1; 2 import java.util.Scanner; 3 public class one { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 System.out.println("请输入x的值:"); 8 Scanner input=new Scanner(System.in); 9 int x=input.nextInt(); 10 if(x==1) { 11 System.out.println("x="+1); 12 }else if(x==5) { 13 System.out.println("x="+5); 14 15 }else if(x==10) { 16 System.out.println("x="+10); 17 }else { 18 System.out.println("none"); 19 } 20 21 22 } 23 24 }
第二题:用switch结构实现第1题
1 package test1; 2 import java.util.Scanner; 3 public class one { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 System.out.println("请输入x的值:"); 8 Scanner input=new Scanner(System.in); 9 int x=input.nextInt(); 10 switch(x) { 11 case 1: 12 case 5: 13 case 10: 14 System.out.println("x="+x); 15 break; 16 default: 17 System.out.println("x=none"); 18 } 19 } 20 }
第三题: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)
1 package test1; 2 import java.util.Scanner; 3 public class one { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 System.out.println("请输入x的值:"); 8 Scanner input=new Scanner(System.in); 9 int x=input.nextInt(); 10 if(x%5==0&&x%6==0) { 11 System.out.println("能被5和6整除"); 12 }else if(x%5==0&&x%6!=0) { 13 System.out.println("只能被5整除"); 14 }else if(x%6==0&&x%5!=0) { 15 System.out.println("只能被6整除"); 16 }else if(x%5!=0||x%6!=0) { 17 System.out.println("不能被5或6整除"); 18 }else { 19 System.out.println("重新输入"); 20 } 21 22 } 23 }
第四题: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)
1 package test1; 2 import java.util.Scanner; 3 public class one { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 System.out.println("请输入分数:"); 8 Scanner input=new Scanner(System.in); 9 int x=input.nextInt(); 10 if(x<=100&&x>=90) { 11 System.out.println("等级为A!"); 12 }else if(x<=89&&x>=80) { 13 System.out.println("等级为B!"); 14 }else if(x<=79&&x>=70) { 15 System.out.println("等级为C!"); 16 }else if(x<=69&&x>=60) { 17 System.out.println("等级为D!"); 18 }else if(x<=59&&x>=0){ 19 System.out.println("等级为E!"); 20 }else { 21 System.out.println("重新输入!"); 22 } 23 } 24 }
第五题: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)
1 package test1; 2 import java.util.Scanner; 3 public class one { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 System.out.println("请分别输入三个值:"); 8 Scanner input=new Scanner(System.in); 9 int n; 10 int x=input.nextInt(); 11 int y=input.nextInt(); 12 int z=input.nextInt(); 13 if(x>y&&y>z){ 14 System.out.println(" "+z+" "+y+" "+x); 15 }else if(y>x&&x>z){ 16 System.out.println(" "+y+" "+z+" "+x); 17 }else if(z>x&&x>y){ 18 System.out.println(" "+y+" "+x+" "+z); 19 }else if(y>z&&z>x){ 20 System.out.println(" "+x+" "+z+" "+y); 21 }else if(x>z&&z>y){ 22 System.out.println(" "+y+" "+z+" "+x); 23 }else if(z>y&&y>x){ 24 System.out.println(" "+x+" "+y+" "+z); 25 } 26 } 27 }