java第四次上机练习+作业
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 First; import java.util.Scanner; public class F1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个年份"); int year = input.nextInt(); if ((year%4==0&&year%100!=0)||(year%400==0)) { System.out.println("是闰年"); } else { System.out.println("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 First; import java.util.Random; import java.util.Scanner; public class F2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Random r = new Random(); Scanner input = new Scanner(System.in); int m = r.nextInt(10); System.out.println("幸运数字是" + m); System.out.println("输入一个四位会员卡号"); int n = input.nextInt(); if (n % 1000 / 100 == m) { System.out.println("您是幸运会员"); } else { System.out.println("您不是幸运会员"); } } }
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 First; import java.util.Scanner; public class F3 { /** * @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(); int y; if (x > 0) { y = x + 3; System.out.println("y=" + y); } else if (x == 0) { System.out.println("y=" + 0); } else { y = x * 2 - 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 First; import java.util.Scanner; public class F4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入三个数"); 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("这三个数能构成三角形"); } else { System.out.println("这三个数不能构成三角形"); } } }
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 First; import java.util.Scanner; public class L1 { /** * @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(); int day; switch (month) { case 4: case 6: case 9: case 11: System.out.println("该月有" + 30 + "天"); break; default: System.out.println("该月有" + 31 + "天"); break; case 2: if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { System.out.println("该月有" + 29 + "天"); } else { System.out.println("该月有" + 28 + "天"); } } } }
2.给定一个成绩a,使用switch结构求出a的等级
package First; import java.util.Scanner; public class L2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入成绩"); int g = input.nextInt(); switch (g / 10) { case 10: case 9: System.out.println("等级A"); break; case 8: System.out.println("等级B"); break; case 7: System.out.println("等级C"); break; case 6: System.out.println("等级D"); break; default: System.out.println("等级E"); break; } } }
3.输入一个数字,判断是一个奇数还是偶数
package First; import java.util.Scanner; public class L3 { /** * @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(); if (a % 2 == 0) { System.out.println("该数是偶数"); } else { System.out.println("该数是奇数"); } } }
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 First; import java.util.Scanner; public class L4 { /** * @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 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和6整除)
package First; import java.util.Scanner; public class L5 { /** * @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 x = input.nextInt(); if (x % 30 == 0) { System.out.println("能被5和6整除"); } else if (x % 5 == 0) { System.out.println("能被5整除"); } else if (x % 6 == 0) { System.out.println("能被6整除"); } else if (x % 30 != 0) { System.out.println("不能被5或6整除"); } } }