Question

我正在尝试开发一个程序来计算到2100年的海平面。根据研究我发现海平面将是2.5英尺（30英寸） - 6.5英尺（这是78英寸）。我的程序要求用户输入他们想要计算海平面上升多少英寸的年份，但我希望每年的信息是.3488和.9069英寸之间的随机数，因为这些是每年的平均值。海平面2.5英尺和6.5英尺。所以我的问题是如何为用户输入的每年生成随机数，这样我就可以计算出海平面上升了多少，然后以加仑数输出。

  /takes the input from the user of all the way up to which year 
  /they want to know the number of inches/ gallons the sea level has risen
  /using reiman summs and a chart
  /
  /
  /*******************************************************************************/
 import java.util.Random;
 import java.util.Scanner;

  public class CalcProject
  {

  public static void main(String[] args)
  {
  //variables for the program
  int year;
  int numOfYears;
  double leastRise = .3488;  //y = .3488x , x is the inches of rainfall
  double highRise = .9069;   //y= .9069x , x is the inches of rainfall
  double seaLevel1;
  double seaLevel2;


  //Describing what the program does to the user
  System.out.println("This program caluclates the number of gallons / inches" +
                     "the sea level will rise based on your input." + "\n");

  //Asking for the users year they want to calculate
  System.out.println("Please enter which year you wish to know how much the water level will have            risen since 2014");

  Scanner scan = new Scanner(System.in);
  year = scan.nextInt();

  if(year <= 2014 || year > 2100)     
  {
    do
     {
      System.out.println("Please enter a valid year between 2015 and 2100");
      year = scan.nextInt();

     } while((year <= 2014 || year > 2100));

   }

   //puts the year into a number of years from 2014
   numOfYears = year-2014;
   System.out.println("The number of years between now and the year you chose is: " +                       numOfYears);

   //uses the least inches of sealevel
   seaLevel1 = numOfYears * leastRise;
   System.out.println("The total sealevel in inches is " + seaLevel1 + " for " + year);

   //uses the most inches of seaLevel
   seaLevel2 = numOfYears * highRise;
   System.out.println("The total sealevel in inches is " + seaLevel2 + " for " + year);

   //calculating radnom numbers for each year

Answer 1

这是一种处理奇怪随机数的简单方法。

int numOfYears;
double leastRise = .3488;
double highRise = .9069;
double seaLevel3 = 0;

int i = 0;
while (i < numOfYears) {
    double rand = Math.random();
    if (rand >= leastRise && rand <= highRise) {
        // rand is some sea level value representing a year
        seaLevel3 += rand;
        i++;
    }
}
System.out.println("The total sealevel in inches is " + seaLevel3 + " for " + year);

海平面Java项目

1 个答案: