java 第四次作业
1.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)
import java.util.Scanner;
public class testhello {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int year;
Scanner scanner = new Scanner(System.in);
year=scanner.nextInt();
if(year%4==0&&year%100!=0||year%400==0){
System.out.println(year+"是闰年");
}else{
System.out.println(year+"不是闰年");
}
}
2.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 lss;
import java.util.Random;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.println("输入一个四位会员号");
int a = input.nextInt();
int b;
b = a/100%10;
Random r = new Random();
int s = r.nextInt(10);
if(b==s){
System.out.println("是幸运会员");
}else{
System.out.println("是普通会员");
}
}
}
3.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 lss;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner s = new Scanner(System.in);
int x = s.nextInt();
int y;
if(x>=0){
if(x==0){
y=0;
}else{
y = x+3;
}
}else{
y = x*2-1;
}
System.out.println(y);
}
}
4.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 lss;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner s = new Scanner(System.in);
int a,b,c;
a = s.nextInt();
b = s.nextInt();
c = s.nextInt();
if(a+c>b){
if(a+b>c){
if(b+c>a){
System.out.println("可以");
}else{
System.out.println("不可以");
}
}else{
System.out.println("不可以");
}
}else{
System.out.println("不可以");
}
}
}
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 lss;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner s = new Scanner(System.in);
System.out.println("输入年月");
int year = s.nextInt();
int month = s.nextInt();
int day = 0;
switch(month){
case 1:day=31;break;
case 2:day=28;break;
case 3:day=31;break;
case 4:day=30;break;
case 5:day=31;break;
case 6:day=30;break;
case 7:day=31;break;
case 8:day=31;break;
case 9:day=30;break;
case 10:day=31;break;
case 11:day=30;break;
case 12:day=31;break;
};
if(year%4==0&&year%100==0||year%400==0){
if(month==2){
day=29;
}
}
System.out.println(day);
}
}
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 lss;
import java.util.Random;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner s = new Scanner(System.in);
System.out.print("输入成绩: ");
int a = s.nextInt();
switch(a/10){
case 10:
case 9:
System.out.println("成绩等级:A");
break;
case 8:
System.out.println("成绩等级:B");
break;
case 7:
System.out.println("成绩等级:C");
break;
case 6:
System.out.println("成绩等级:D");
break;
default:
System.out.println("成绩等级:E");
}
}
}
3、输入一个数字,判断是一个奇数还是偶数
package lss;
import java.util.Random;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.print("输入数字");
Scanner s = new Scanner(System.in);
int a = s.nextInt();
if(a % 2 == 0){
System.out.println("偶数");
}else{
System.out.println("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 lss;
import java.util.Random;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("输入X的值");
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("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 lss;
import java.util.Random;
import java.util.Scanner;
public class homework {
/**
* @param args
*/
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 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!=0){
System.out.println("能被5整除");
} else if(a%5!=0&&a%6==0){
System.out.println("能被6整除");
} else if(a%5!=0&&a%6!=0)
System.out.println("不能被5或6整除");
}
}