package shousi;
import java.math.BigDecimal;
import java.util.Random;
import java.util.Scanner;
/**
* 模拟发红包
*/
public class Test4 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入红包金额数");
double money = sc.nextDouble();
System.out.println("请输入红包个数");
int num = sc.nextInt();
BigDecimal[] arr = new Test4().red(new BigDecimal(money), num);
for (int i = 0; i < arr.length; i++)
System.out.println("第一个人的红包数是:"+arr[i].doubleValue());
}
public BigDecimal[] red(BigDecimal money,int num) throws RuntimeException{
if(money.doubleValue() < num*0.01) {
throw new RuntimeException("金额不对...");
}
Random random = new Random();
//使用分 进行金额运算
int allMoney = money.multiply(BigDecimal.valueOf(100)).intValue();
int count = 0;//存储所有人的随机点数和
double[] perCount = new double[num];//存储每一个人的随机点数
BigDecimal[] perMoney = new BigDecimal[num];//存储每个人的红包金额
//给每个人分配一个随机数
for (int i = 0; i < perCount.length; i++) {
int r = random.nextInt((num)*99)+1;
count += r;
perCount[i] = r;
}
int c = 0;
//分配红包金额
for (int i = 0; i < perCount.length; i++) {
Double x = new Double(perCount[i] / count);
int m = (int)Math.floor(x*allMoney);
System.out.println(m);
if(m == 0)
m = 1;
c += m;
if(i < perCount.length - 1) {
perMoney[i] = (new BigDecimal(m).divide(new BigDecimal(100)));
}else {
perMoney[i] = (new BigDecimal(allMoney - c + m).divide(new BigDecimal(100)));
}
}
return perMoney;
}
}
java模拟发红包
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转载自blog.csdn.net/weixin_44026997/article/details/104773260
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