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 qq; import java.util.Scanner; public class zz { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); 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("none"); } } }
2.用switch结构实现第1题
package qq; import java.util.Scanner; public class zz { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入x的值"); int x=input.nextInt(); switch(x){ case 1: System.out.println(1); break; case 5: System.out.println(55); break; case 10: System.out.println(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 qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入x的值"); int x=input.nextInt(); if(x%5==0&&x%6==0){ System.out.println(x+"能被5或6整除"); }else if(x%5==0&&x%6!=0){ System.out.println(x+"只能被5整除"); }else if(x%6==0&&x%5!=0){ System.out.println(x+"只能被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(知识点:条件语句if elseif)
package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入一个分数"); int x=input.nextInt(); if(x>100){ System.out.println("分数无效"); }else if(x>=90){ System.out.println("A"); }else if(x>=80){ System.out.println("B"); }else if(x>=70){ System.out.println("C"); }else if(x>=60){ System.out.println("D"); }else if(x>=50){ 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 qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入三个数"); int x=input.nextInt(); int y=input.nextInt(); int z=input.nextInt(); int d; if(x>y){ d=x; x=y; y=d; }if(x>z){ d=x; x=z; z=d; }if(y>z){ d=y; y=z; z=d; }System.out.println(x+"<"+y+"<"+z); } }