package cn.itcast_02;

import java.math.BigDecimal;

/*
 * 构造方法:
 *     public BigDecimal(String val):
 * 
 * 金融相关的东西(例:银行钱的小数,商品价格小数,实验小数)
 * 
 * 成员方法:
 *     public BigDecimal add(BigDecimal augend):加
 *     public BigDecimal subtract(BigDecimal subtrahend):减
 *     public BigDecimal multiply(BigDecimal multiplicand):乘
 *     public BigDecimal divide(BigDecimal divisor):除
 *     public BigDecimal divide(BigDecimal divisor,int scale,int roundingMode):商,几位小数,如何舍取。
 *     
 */
public class BigDecimalDemo {
  public static void main(String[] args) {
    System.out.println(0.09 + 0.01);
    System.out.println(1.0 - 0.32);
    System.out.println(1.015 * 100);
    System.out.println(1.301 / 100);

    // public BigDecimal add(BigDecimal augend):加
    BigDecimal bd1 = new BigDecimal("0.09");
    BigDecimal bd2 = new BigDecimal("0.01");
    System.out.println("add:" + bd1.add(bd2));
    System.out.println("----------------------");
    // public BigDecimal subtract(BigDecimal subtrahend):减
    BigDecimal bd3 = new BigDecimal("1.0");
    BigDecimal bd4 = new BigDecimal("0.32");
    System.out.println("subtract:" + bd3.subtract(bd4));
    System.out.println("----------------------");
    // public BigDecimal multiply(BigDecimal multiplicand):乘
    BigDecimal bd5 = new BigDecimal("1.015");
    BigDecimal bd6 = new BigDecimal("100");
    System.out.println("multiply:" + bd5.multiply(bd6));
    System.out.println("----------------------");
    // public BigDecimal divide(BigDecimal divisor):除
    BigDecimal bd7 = new BigDecimal("1.301");
    BigDecimal bd8 = new BigDecimal("100");
    System.out.println("divide:" + bd7.divide(bd8));
    System.out.println("divide:" + bd7.divide(bd8,3,BigDecimal.ROUND_HALF_UP));
    System.out.println("divide:" + bd7.divide(bd8,9,BigDecimal.ROUND_HALF_UP));
  }
}