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)
import java.util.*; import java.util.concurrent.SynchronousQueue; public class dddd { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入x值"); int x=input.nextInt(); if(x==1){ System.out.println("x=1"); } else if(x==5){ System.out.println("x=5"); } else if(x==10){ System.out.println("x=10"); } else { System.out.println("x=none"); } } }
2.用switch结构实现第1题
import java.util.*; import java.util.concurrent.SynchronousQueue; public class dddd { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入x值"); int x=input.nextInt(); switch(x){ case 1: System.out.println("x=1"); break; case 5: System.out.println("x=5"); break; case 10: System.out.println("x=10"); break; default: System.out.println("x=none"); break; } } }
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)
import java.util.*; import java.util.concurrent.SynchronousQueue; public class dddd { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入x值"); int x=input.nextInt(); if(x%5==0&&x%6==0){ System.out.println("能被5.6整除"); } else if(x%5==0&&x%6!=0){ System.out.println("能被5整除"); } else if(x%5!=0&&x%6==0){ System.out.println("能被6整除"); } else{ System.out.println("不能被5.6整除"); } } }
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)
import java.util.*; import java.util.concurrent.SynchronousQueue; public class dddd { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入分数"); int x=input.nextInt(); if(x<0||x>100){ System.out.println("输入无效"); } else if(x<100&&x>90){ System.out.println("a"); } else if(x<90&&x>80){ System.out.println("b"); } else if(x<80&&x>70){ System.out.println("c"); } else if(x<70&&x>60){ System.out.println("d"); } else if(x>0&&x<60){ System.out.println("e"); } } }
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)
import java.util.*; import java.util.concurrent.SynchronousQueue; public class dddd { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入x y z"); int x=input.nextInt(); int y=input.nextInt(); int z=input.nextInt(); int n; if(x>y){ n=x; x=y; y=n; } if(x>z){ n=x; x=z; z=n; } if(y>z){ n=y; y=z; z=n; } System.out.println("三个数从小到大"+x+","+y+","+z); } }