Java中分别取数的整数及小数部分

Posted 2020-08-09

import java.math.BigDecimal;
import java.util.Scanner;

/**
 * Created by Administrator on 2016/9/20.
 */
public class BigDecimalGetNumbers {
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        double dInput = in.nextDouble();
        long longPart = (long) dInput;
        BigDecimal bigDecimal = new BigDecimal(Double.toString(dInput));
        BigDecimal bigDecimalLongPart = new BigDecimal(Double.toString(longPart));
        double dPoint = bigDecimal.subtract(bigDecimalLongPart).doubleValue();
        System.out.println("整数部分为:" + longPart + "\n" + "小数部分为: " + dPoint);
    }
}

测试数据：1.234567E4

1.234567E4
整数部分为:12345
小数部分为: 0.67

Process finished with exit code 0