Java第二次作业
1 输入年份月份,输出该月的天数(闰年2月29天,条件参考上机练习1)
package wen;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("输入年份");
int year=input.nextInt();
System.out.println("输入月份");
int m=input.nextInt();
switch(m) {
case 4:
case 6:
case 9:
case 11:
System.out.println("30天");
break;
case 2:
if (year%4==0&&year%100==0||year%400==0) {
System.out.println("29天");
} else {
System.out.println("28天");
}
break;
default:
System.out.println("31天");
break;
}
}
}
2、给定一个成绩a,使用switch结构求出a的等级
。A:90-100,B:80-89,C:70-79,D:60-69,E:0~59
package wen;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("请输入成绩:");
int a=input.nextInt();
switch(a/10) {
case 10:
case 9:
System.out.println("A");
break;
case 8:
System.out.println("B");
break;
case 7:
System.out.println("C");
break;
case 6:
System.out.println("D");
break;
default:
System.out.println("E");
break;
}
}
}
3、输入一个数字,判断是一个奇数还是偶数
package wen;
import java.util.Scanner;
public class Test {
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:");
int a=input.nextInt();
if (a%2==0) {
System.out.println("您输入的"+a+"是一个偶数");
} else {
System.out.println("您输入的"+a+"是一个奇数");
}
}
}
4、编写程序, 判断一个变量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 wen;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("输入变量x:");
int x=input.nextInt();
if (x==1||x==5||x==10) {
switch(x) {
case (1):
System.out.println("x=1");
break;
case (5):
System.out.println("x=5");
break;
case (10):
System.out.println("x=10");
break;
}
}
else {
System.out.println("x=none");
}
}
}
5、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 wen;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("输入一个数:");
int x=input.nextInt();
if (x%5==0&&x%6==0) {
System.out.println("能被5和6同时整除");
}
if (x%5==0&&x%6!=0) {
System.out.println("只能被5整除");
}
if (x%5!=0&&x%6==0) {
System.out.println("只能被6整除");
}
if (x%5!=0&&x%6!=0) {
System.out.println("不能被5和6整除");
}
}
}
6.输入一个年份,判断是不是闰年(能被4整除但不能被100整除,或者能被400整除)
package wen;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("输入一个年份");
int year=input.nextInt();
if(year%4==0&&year%100!=0||year%400==0)
System.out.println("闰年");
else
System.out.println("平年");
}
}
7.输入一个4位会员卡号,如果百位数字是随机数,就输出是幸运会员,否则就输出不是.
package wen;
import java.util.Random;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
Random r=new Random();
System.out.println("输入一个4位会员卡号");
int hao=input.nextInt();
int b=hao/100%10;
int a=r.nextInt(10);
System.out.println("幸运数是"+a);
if (b==a)
System.out.println("是幸运会员");
else
System.out.println("不是幸运会员");
}
}
8.已知函数,输入x的值,输出对应的y的值.
x + 3 ( x > 0 )
y = 0 ( x = 0 )
x*2 –1 ( x < 0 )
package wen;
import java.util.Random;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Random r=new Random();
Scanner input = new Scanner(System.in);
System.out.println("输入x的值");
double x=input.nextDouble();
if(x>0)
System.out.println("y的值是"+(x+3));
else if(x==0)
System.out.println("y的值是"+0);
else
System.out.println("y的值是"+(x*2-1));
}
}
9.输入三个数,判断能否构成三角形(任意两边之和大于第三边)
package wen;
import java.util.Random;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Random r=new Random();
Scanner input = new Scanner(System.in);
System.out.println("依次输入三条边的值");
int a=input.nextInt();
int b=input.nextInt();
int c=input.nextInt();
if(a+b>c&&a+c>b&&b+c>a) {
System.out.println("可以构成三角形");
}else {
System.out.println("不能构成三角形");
}
}
}