1、3个白球 3个红球 6个黑球 随机拿出8个球,算出所有结果
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
public class Ball{ public static void main(String[] args){ int a= 3 ,b= 3 ,c= 6 ,i= 0 ; for ( int x= 0 ;x<=a;x++){ for ( int y= 0 ;y<=b;y++){ for ( int z= 0 ;z<=c;z++){ if (x+y+z== 8 ){ System.out.println( "红球 " + x + "\t白球 " + y + "\t黑球 " + z ); i++; } } } } System.out.println( "有" + i + "结果" ); } } |
2、数字金字塔
1
2
3
4
5
6
7
8
9
10
|
public class Pyramid { public static void main(String args[]){ for ( int i= 1 ; i<= 32 ; i=i* 2 ) { for ( int k= 1 ; k<= 32 /i; k=k* 2 )System.out.print( "\t" ); for ( int j= 1 ; j<=i; j=j* 2 )System.out.print( "\t" +j); for ( int m=i/ 2 ; m>= 1 ; m=m/ 2 ) System.out.print( "\t" +m); System.out.print( "\n" ); } } } |
3、简单的判断日期格式是否正确
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
import java.util.Scanner; public class Date{ public static void main(String[] args) { @SuppressWarnings ( "resource" ) //取消对input的警报 Scanner input= new Scanner(System.in); //声明扫描仪变量 System.out.println( "请输入----年--月--日" ); //系统提示输入 int y = input.nextInt(); int m = input.nextInt(); int d = input.nextInt(); if (y>= 1900 &&y<= 2050 &&m>= 1 &&m<= 12 &&d>= 1 &&d<= 31 ) System.out.print( "日期正确" ); else System.out.print( "日期不正确" ); } } |
4、计算1+2/3+3/5+4/7+5/9…的前20项的和
1
2
3
4
5
6
7
8
|
public class Num{ public static void main(String[] args) { double sum= 0 ; for ( int i= 1 ;i<= 10 ;i++) sum=sum+i/( 2.0 *i- 1 ); System.out.println(sum); } } |
5、给出本金,利率,年限计算存款(以函数的方式)
1
2
3
4
5
6
7
8
9
10
11
12
|
public class Bank { public static double CBM( double money, double interest, int years){ for ( int i= 1 ;i<=years;i++){ money = money *( 1 + interest); } return money; } public static void main(String[] args) { System.out.println( "300000元10年后的存款金额为" +CBM( 300000 , 0.07 , 20 )); System.out.println( "200000元20年后的存款金额为" +CBM( 200000 , 0.06 , 20 )); } } |
6、计算五边形的面积。输入r,求面积s
1
2
3
4
5
6
7
8
9
10
11
12
13
|
import java.util.Scanner; public class Circular{ public static void main(String[] args) { @SuppressWarnings ( "resource" ) //取消对input的警报 Scanner input= new Scanner(System.in); //声明扫描仪变量 System.out.println( "请输入五边形半径" ); //系统提示输入 double r = input.nextDouble(); double S; S= 5 *( 2 *r*Math.sin(Math.PI/ 5 )*(Math.pow( 2 *r*Math.sin(Math.PI/ 5 ), 2 ))/( 4 *Math.tan(Math.PI/ 5 ))); System.out.println( "五边形的面积为" +S); } } |
原文链接:https://www.idaobin.com/archives/375.html