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 pra; import java.util.Scanner; public class Text1 { 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 a = input.nextInt(); if (a % 4 == 0 && a % 100 != 0 || a % 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3的倍数,就输出是幸运会员,否则就输出不是
package pra; import java.util.Scanner; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入四位会员卡号:"); int a = input.nextInt(); if ((a % 1000 / 100) % 3 == 0 ) { System.out.println("是幸运会员"); } 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 )
x2 –1 ( x < 0 )
package pra; import java.util.Scanner; public class Text1 { 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(整数):"); int x = input.nextInt(); int y; if(x > 0) { y = x + 3; System.out.println("y的值是:" + y); }else if(x == 0) { System.out.println("y的值是:0"); }else if(x < 0) { y = x * x - 1; System.out.println("y的值是:" + 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 pra; import java.util.Scanner; public class Text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入三角形的三边(整数):"); int a = input.nextInt(); //三角形的三边 int b = input.nextInt(); int c = input.nextInt(); int d = a + b; //任意两边之和 int e = a + c; int f = b + c; if(d > c && e > b && f > a) { System.out.println("能够成三角形"); } else { System.out.println("不能构成三角形"); } } }