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 job; import java.util.Scanner; public class ZuoYe { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入一个值"); int x=input.nextInt(); if(x==1){ System.out.println("x="+x); }else if(x==5){ System.out.println("x="+x); }else if(x==10){ System.out.println("x="+x); }else{ System.out.println("x=none"); } } }
2.用switch结构实现第1题
package job; import java.util.Scanner; public class ZuoYe2 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入一个值"); int x=input.nextInt(); switch(x){ case 1: case 5: case 10: System.out.println("x="+x); break; default: System.out.println("x=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 job; import java.util.Scanner; public class ZuoYe3 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入一个值"); int a=input.nextInt(); if(a%6==0&&a%5==0){ System.out.println("能被5和6整除"); }else if(a%5==0&&a%6!=0){ System.out.println("只能被5整除"); }else if(a%6==0&&a%5!=0){ System.out.println("只能被6整除"); }else{ System.out.println("不能被5和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 job; import java.util.Scanner; public class ZuoYe4 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("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D"); }else if(x>=0&&x<=59){ System.out.println("分数等级为E"); }else{ System.out.println("数值超过范围"); } }
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 job; import java.util.Scanner; public class ZuoYe5 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入3个数值"); int x=input.nextInt(); int y=input.nextInt(); int z=input.nextInt(); int[] a={x,y,z}; for(int i=1;i<a.length;i++){ for(int j=0;j<a.length-i;j++){ if(a[j]>a[j+1]){ int temp=a[j]; a[j]=a[j+1]; a[j+1]=temp; } } } System.out.println("排序成功后为"+a[0]+";"+a[1]+";"+a[2]); } }