java基础作业1附答案

1. X (x<1)

Y= 2x-1 (1

3x-11 (x>10) 要求输入x值后，输出y值。 package student.xiaoqiao.day01;

import java.util.Scanner；

public class Yi { public static void main(String[] args) { }

}

2. 输入一个年份判断year是否是闰年

package student.xiaoqiao.day01;

import java.util.Scanner;

public class Er { public static void main(String[] args) { System.out.println(\请输入年份\ Scanner sc=new Scanner(System.in); int year=sc.nextInt(); if((year%4==0&year0!=0)|(year@0==0)) System.out.println(\是闰年\

System.out.println(\请输入一个数\

Scanner sc = new Scanner(System.in); int x = sc.nextInt(); if (x < 1) { System.out.println(\}

if (x > 1 & x < 10) { System.out.println(\}

if (x > 10) { System.out.println(\}

}

}

else

System.out.println(\不是闰年\

3. 任意输入a,b,c 3个数判断a，b，c大小 package student.xiaoqiao.day01;

import java.util.Scanner;

public class San { public static void main(String[] args) { }

4_1输出图形

* *** ***** }

System.out.println(\请输入三个数（加空格或回车）:\Scanner sc = new Scanner(System.in); int x = sc.nextInt(); int y = sc.nextInt(); int z = sc.nextInt(); if (x > y & x > z) { System.out.println(x); } else if (x < y & z < y) { System.out.println(y); } else if (x < z & y < z) { System.out.println(z); }

package student.xiaoqiao.day01;

public class Si_1 { public static void main(String[] args) { int temp = 3; for (int i = 1; i <= temp; i++) { for (int j = 1; j <= temp - i; j++) { System.out.print(\ } for (int k = 1; k <= 2 * i - 1; k++) { System.out.print(\ } System.out.print('\\n'); } } }

4_2输出图形 ***** *** *

package student.xiaoqiao.day01;

public class Si_1 { public static void main(String[] args) { int temp = 3; for (int i = 1; i <= temp; i++) { for (int j = 1; j <= temp - i; j++) { System.out.print(\ } for (int k = 1; k <= 2 * i - 1; k++) { System.out.print(\

}

System.out.print('\\n');

}

}

}

4_3输出图形任意输入n

当输入n值为1时，输出 *

当输入n值为2时，输出 当输入n值为3时，输出 当输入n值为5时，输出 * *** ***** ******* ********* ******* *****

.。。。。。

***

*

package student.xiaoqiao.day01;

import java.util.Scanner;

public class Si_3 { public static void main(String[] args) { }

}

System.out.println(\请输入一个数：\Scanner sc=new Scanner(System.in); int temp = sc.nextInt();

for (int i = 1; i <= temp; i++) { for (int j = 1; j <= temp - i; j++) { System.out.print(\ } for (int k = 1; k <= 2 * i - 1; k++) { System.out.print(\ } System.out.print('\\n'); }

for (int i = temp; i >= 1; i--) { for (int j = i-1; j < temp; j++) { System.out.print(\ } for (int k = 1; k <= 2 * i - 3; k++) { System.out.print(\ } }

System.out.print('\\n');

4_4 输出图形 ***