第四周上机作业
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 jia; import java.util.Scanner; public class text2 { 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==1){ System.out.println("x的值为1"); }else if(x==5){ System.out.println("x的值为5"); }else if(x==10){ System.out.println("x的值为10"); }else{ System.out.println("x=none"); } }
2.用switch结构实现第1题
package jia; import java.util.Scanner; public class text3 { 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){ case1: System.out.println("输出x得1"); break; case5: System.out.println("输出x得5"); break; case10: System.out.println("输出x得10"); 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 jia; import java.util.Scanner; public class text4 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入一个数a"); int a=input.nextInt(); if(a%5==0&&a%6==0){ System.out.println("能被5和6整除"); }else if(a%5==0&&a%6==1){ System.out.println("只能被5整除"); }else if(a%5==1&&a%6==0){ System.out.println("只能被6整除"); }else if(a%5==1&&a%6==0){ System.out.println("不能被5和6整除"); }else{ System.out.println("请重新输入"); } } }
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 jia; import java.util.Scanner; public class text5 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入学生成绩result"); double result=input.nextDouble(); if (result>=90&&result<100){ System.out.println("此同学成绩为A"); }else if(result>=80&&result<90){ System.out.println("此同学成绩为B"); }else if(result>=70&&result<80){ System.out.println("此同学成绩为C"); }else if(result>=60&&result<70){ System.out.println("此同学成绩为D"); }else if(result<60){ System.out.println("此同学成绩为E"); }else{ System.out.println("此同学成绩为无效"); } } }
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 jia; import java.util.Scanner; public class text6 { 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 a=input.nextInt(); int b=input.nextInt(); int c=input.nextInt(); int i; if(a>b){ i=a; a=c; c=i; } if(b<c){ i=a; a=c; c=i; } if(b>c){ i=b; b=c; c=i; } System.out.println("则三个数由小到大的顺序为"+a+","+b+","+c); } }