JAVA——第二章2.11

JAVA——第二章2.11 问题：人口预测 重写编程练习题1.11，提示用户输入年数，然后显示这个年数之后的人口值。使用编程练习题1.11中的提示。

import java.util.Scanner;
public class Population {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the number of years:");
        int year = input.nextInt();
        double second = 24*60*60;
        double born = second/7.0;//每天出生人口
        double death = second/13.0;//每天死亡人口
        double immigrant = second/45.0;//每天移民人口
        double people = born - death + immigrant;//每天增加人口
        double peopleYear = people * 365;//每年增加人口
        double peopleNow = 312032486;
        double a = peopleNow+year*peopleYear;
        System.out.println("The population in " + year + "is " + a);
    }
}