课后动手动脑

public static void main(String[] args){
    float a = (float) 1.0;
    float b = (float) 0.965;
    double a1 = 1.0;
    double b1 = 0.965;
    BigDecimal a2 = new BigDecimal(a1);
    BigDecimal b2 = new BigDecimal(b1);
    BigDecimal a3 = new BigDecimal(new String("1.0"));
    BigDecimal b3 = new BigDecimal(new String("0.965"));
 
    System.out.println("float:"+(a-b));
    System.out.println("double:"+(a1-b1));
    System.out.println("BigDecimal use Double:"+a2.subtract(b2));
    System.out.println("BigDecimal use String:"+a3.subtract(b3));
}

float:0.035000026
double:0.03500000000000003
BigDecimal use Double:0.03500000000000003108624468950438313186168670654296875
BigDecimal use String:0.035