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)
package School.Day4;
import java.util.Scanner;
public class Test01 {
public static void main(String[] args){
System.out.print("输入年份: ");
Scanner s = new Scanner(System.in);
int year = s.nextInt();
if(year%100==0){
if(year%400 ==0){
System.out.println("该年是闰年");
}else{
System.out.println("该年是平年");
}
}else{
if(year%4==0||year%400==0){
System.out.println("该年是闰年");
}else{
System.out.println("该年是平年");
}
}
}
}
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 School.Day4;
import java.util.Random;
import java.util.Scanner;
public class Test02 {
public static void main(String[] args){
Random r = new Random();
Scanner s = new Scanner(System.in);
System.out.print("输入会员号: ");
int huiyuan = s.nextInt();
int x = r.nextInt(9);
System.out.println("幸运随机数: " + x);
if(huiyuan%1000/100==x){
System.out.println("恭喜您，中奖了!");
}else{
System.out.println("很遗憾，没中奖!");
}
}
}
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 School.Day4;
import java.util.Scanner;
public class Test03 {
public static void main(String[] args){
System.out.print("输入X: ");
Scanner s = new Scanner(System.in);
int x = s.nextInt();
int y;
if(x>0){
y = x+3;
}else if(x==0){
y = 0;
}else {
y = 2*x-1;
}
System.out.println("Y==" + 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 School.Day4;
import java.util.Scanner;
public class Test04 {
public static void main(String[] args){
Scanner s = new Scanner(System.in);
System.out.print("输入边长: ");
double a = s.nextDouble();
System.out.print("输入边长: ");
double b = s.nextDouble();
System.out.print("输入边长: ");
double c = s.nextDouble();
if(a+b>c&&a+c>b&&b+c>a){
System.out.println("可以构成三角形");
}else{
System.out.println("不可以构成三角形");
}
}
}
5. 输入年份月份，输出该月的天数
package School.Day4;
import java.util.Scanner;
public class Test05 {
public static void main(String[] args){
Scanner s = new Scanner(System.in);
System.out.print("输入年份: ");
int year = s.nextInt();
System.out.print("输入月份: ");
int month = s.nextInt();
int day;
switch(month){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
day = 31;
break;
case 2:
day = 28;
break;
default:
day = 30;
}
if(year%100==0){
if(year%400==0&&month ==2){
day = 29;
}
}else{
if(year%4==0||year%400==0){
if (month == 2) {
day = 29;
}
}
}
System.out.println( year + "年" + month + "月有" + day + "天" );
}
}
6.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 School.Day4;
import java.util.Scanner;
public class Test06 {
public static void main(String[] args){
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");
}
}
}
7.输入一个数字，判断是一个奇数还是偶数
package School.Day4;
import java.util.Scanner;
public class Test07 {
public static void main(String[] args){
System.out.print("输入数字: ");
Scanner s = new Scanner(System.in);
int x = s.nextInt();
if(x%2==0){
System.out.println("这个数是偶数");
}else{
System.out.println("这个数是奇数");
}
}
}
8.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 School.Day4;
import java.util.Scanner;
public class Test08 {
public static void main(String[] args){
Scanner s = new Scanner(System.in);
System.out.print("输入变量: ");
int x = s.nextInt();
switch(x){
case 1:
x = 1;
break;
case 5:
x = 5;
break;
case 10:
x = 10;
break;
default:
System.out.println("none");
return;
}
System.out.println("变量是: " + x);
}
}
9.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 School.Day4;
import java.util.Scanner;
public class Test09 {
public static void main(String[] args) {
System.out.print("输入一个数: ");
Scanner s = new Scanner(System.in);
int x = s.nextInt();
if (x%5==0 && x%6==0) {
System.out.println(x + "可以被5和6整除");
}else if (x%5==0) {
System.out.println(x + "可以被5整除");
}else if (x%6==0) {
System.out.println(x + "可以被6整除");
}else{
System.out.println(x + "不可以被5或者6整除");
}
}
}
