Java最常用的6个简单的计算题

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");     } }

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");         }       }    } 

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");   } } 

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);	}}

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));   } } 

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);   } }