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 qwe; import java.util.*; public class asd { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("请输入变量x"); int x=input.nextInt(); if(x==1){ System.out.println("x等于"+x); }else if(x==5){ System.out.println("x等于"+x); }else if(x==10){ System.out.println("x等于"+x); }else{ System.out.println("x=none"); } } }
2.用switch结构实现第1题
package qwe; import java.util.*; public class asd { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("请输入变量x"); int x=input.nextInt(); switch (x){ case 1: System.out.println("x="+x); break; case 5: System.out.println("x="+x); break; case 10: System.out.println("x="+x); 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)
package qwe; import java.util.*; public class asd { 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(); if(x%5==0 && x%6==0){ System.out.println("能被5和6整除"); }else if(x%5==0){ System.out.println("能被5整除"); }else if(x%6==0){ System.out.println("能被6整除"); }else if(x%5!=0 || x%6!=0){ System.out.println("不能被5或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 qwe; import java.util.*; public class asd { public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("请输入一个分数"); int x=input.nextInt(); if(x>=90 && x<=100){ System.out.println("分数等级为A"); }else if(x>=80 && x<=89){ System.out.println("分数等级为B"); }else if(x>=70 && x<=79){ System.out.println("分数等级为C"); }else if(x>=60 && x<=69){ System.out.println("分数等级为E"); }else if(x>=50 && x<=59){ System.out.println("分数等级为F"); }else if(x>=40 && x<=49){ System.out.println("分数等级为G"); }else if(x>=30 && x<=39){ System.out.println("分数等级为H"); }else if(x>=20 && x<=29){ System.out.println("分数等级为I"); }else if(x>=10 && x<=19){ System.out.println("分数等级为J"); }else if(x>=0 && x<=9){ System.out.println("分数等级为K"); }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)
package qwe; import java.util.Scanner; public class tese1 { 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(); System.out.println("请输入y的值"); int y=input.nextInt(); System.out.println("请输入z的值"); int z=input.nextInt(); if(x>y&&y>z){ System.out.println("输出"+z+","+y+","+x); }else if(x>z&&z>y) { System.out.println("输出"+y+","+z+","+x); }else if(y>x&&x>z) { System.out.println("输出"+z+","+x+","+y); }else if(y>z&&z>x) { System.out.println("输出"+x+","+z+","+y); }else if(z>y&&y>x) { System.out.println("输出"+x+","+y+","+z); }else if(z>x&&x>y) { System.out.println("输出"+y+","+x+","+z); } } }