第四周上机+作业3.26
上机练习
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 week3; import java.util.Scanner; public class Pra1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入年份"); int year=input.nextInt(); if(year%4==0&&year%100!=0||year%400==0) System.out.println("该年为闰年"); else System.out.println("该年不为闰年"); } }
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 week3; import java.util.Random; import java.util.Scanner; public class Pra2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Random r=new Random(); int a=r.nextInt(4);//产生一个随机数1 Scanner input=new Scanner(System.in); System.out.println("请输入会员号 "); int b=input.nextInt(); if(b%1000/100==a) System.out.println("幸运会员"); else System.out.println("不是幸运会员"); } }
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 week3; import java.util.Scanner; public class Pra3 { /** * @param args */ 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"); double x=input.nextDouble(); System.out.println("y的值为"); if(x>0) System.out.println("y="+(x+3)); else if(x==0) System.out.println("y="+0); else System.out.println("y="+(x*2-1)); } }
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 week3; import java.util.Scanner; public class Pra4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请分别输入abc的值"); int a=input.nextInt(); int b=input.nextInt(); int c=input.nextInt(); if(a+b>c&&b+c>a&&a+c>b) System.out.println("能构成三角形"); else System.out.println("不能构成三角形"); } }
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 week3; import java.util.Scanner; public class Work1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入年份"); int year=input.nextInt(); System.out.println("请输入月份"); int month=input.nextInt(); System.out.println("该月天数为"); if (year%4==0&&month==2){ System.out.println("29"); } else if (year%4!=0&&month==2){ System.out.println("28"); } else if (month==1) System.out.println("31"); else if (month==3) System.out.println("31"); else if (month==4) System.out.println("30"); else if (month==5) System.out.println("31"); else if (month==6) System.out.println("30"); else if (month==7) System.out.println("31"); else if (month==8) System.out.println("31"); else if (month==9) System.out.println("30"); else if (month==10) System.out.println("31"); else if (month==11) System.out.println("30"); else if (month==12) System.out.println("31"); } }
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 week3; import java.util.Scanner; public class Work2 { /** * @param args */ 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(); System.out.println("等级为"); switch(a/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; case 5: System.out.println("E"); break; case 4: System.out.println("E"); break; case 3: System.out.println("E"); break; case 2: System.out.println("E"); break; case 1: System.out.println("E"); break; case 0: System.out.println("E"); break; } } }
3、输入一个数字,判断是一个奇数还是偶数
package week3; import java.util.Scanner; public class Work3 { /** * @param args */ 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(); System.out.println("该数为"); 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 week3; import java.util.Scanner; public class Work4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入数x"); int x=input.nextInt(); if(x==1) System.out.println(x); else if(x==5) System.out.println(x); else if(x==10) System.out.println(x); else System.out.println("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 week3; import java.util.Scanner; public class Work5 { /** * @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 x=input.nextInt(); if (x%5==0&&x%6==0) System.out.println("能同时被5和6整除"); else if (x%5==0&&x%6!=0) System.out.println("只能被5整除"); else if (x%5==0&&x%6!=0) System.out.println("只能被6整除"); else if (x%5!=0||x%6!=0) System.out.println("不能被5或6整除"); } }