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 test; import java.util.Scanner; public class Zuoye { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("请输入x的值"); int x=input.nextInt(); if (x==1||x==5||x==10){ System.out.println(x); }else{ System.out.println("none"); } } }
2.用switch结构实现第1题
package test; import java.util.Scanner; public class Zuoye { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("请输入一个数:"); 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("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)
package test; import java.util.Scanner; public class Zuoye { public static void main(String[] args) { System.out.println("***********请输入一个整数*********"); Scanner input=new Scanner(System.in); int a=input.nextInt(); if (a%5==0&&a%6==0){ System.out.println(a+"能被5和6整除"); }else if(a%5==0){ System.out.println(a+"能被5整除"); }else if(a%6==0){ System.out.println(a+"能被6整除"); }else{ System.out.println("不能被5或者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)
package test; import java.util.Scanner; public class Zuoye { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("请输入分数:"); int mark=input.nextInt(); if(mark<=100&&mark>=90){ System.out.println("A"); }else if(mark<=90&&mark>=80){ System.out.println("B"); }else if(mark<=80&&mark>=70){ System.out.println("C"); }else if(mark<=70&mark>=60){ System.out.println("D"); }else if(mark<=60){ System.out.println("E"); }else if(mark<0||mark>100){ 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)
import java.util.Scanner; public class Zuoye { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.print("输入a:"); int a=input.nextInt(); System.out.print("输入b:"); int b=input.nextInt(); System.out.print("输入c:"); int c=input.nextInt(); int max =0; int mid=0; int min=0; if(a>b&&a>c){ max=a; }else if(b>a&&b>c){ max=b; }else{ max=c; } if(a<b&&a<c){ min=a; }else if(b<a&&b<c){ min=b; }else{ min=c; } if(a<b&&a>c||a<c&&a>c){ mid=a; }else if(b<a&&b>c||b>a&&b<c){ mid=b; }else{ mid=c; } System.out.println(min+"<"+mid+"<"+max); } }