1. 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
package hgj; import java.util.Scanner; public class dfg { 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="+x); }else { System.out.println("x=none"); } } }
2.用switch结构写第1题
package huaerzi; import java.util.Scanner; public class huada { public static void main(String[] args) { // TODO Auto-generated method stub Scanner huaer= new Scanner(System.in); System.out.println("请输入a的值"); int a=huaer.nextInt(); switch(a) { case 1: case 5: case 10: System.out.println("a="+a);break; default: System.out.println("a=none"); System.out.println("a=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 hgj; import java.util.Scanner; public class dfg { public static void main(String[] args) { Scanner input= new Scanner(System.in); System.out.println("请输入这个数的值"); int x=input.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6整除"); }else { System.out.println(x+"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
package huaerzi; import java.util.Scanner; public class huada { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("请输入一个整数"); Scanner scanner = new Scanner(System.in); int grade = scanner.nextInt(); if ((grade>100)||(grade<0)) { System.out.println("无效"); } else if ((grade>=80)&&(grade<90)) { System.out.println("B"); } else if ((grade>=90)&&(grade<=100)) { System.out.println("A"); } else if ((grade>=70)&&(grade<80)){ System.out.println("C"); } else if ((grade>=60)&&(grade<70)){ System.out.println("D"); }else 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)
package xx; import java.util.Scanner; public class pika { public static void main(String[] args) { Scanner sc= new Scanner(System.in); System.out.println("请输入x的值"); int x=sc.nextInt(); System.out.println("请输入y的值"); int y=sc.nextInt(); System.out.println("请输入z的值"); int z=sc.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); } } }