In Java, if you need an accurate calculation answer, avoid using double type and float type

The double type and float type are primarily designed for use in scientific and engineering calculations and are used for binary floating-point calculations. For the general calculation is usually inaccurate results, so for the ordinary floating-point addition and subtraction, the solution needs to use Int,long,bigdecimal to calculate.

1. Calculate the problem?

The calculation results are as follows:

Obviously the result is not what we need. The result we need is: 0.88

So, our program should write this:

1      Public Static void Main (string[] args) {2         BigDecimal a=bigdecimal.valueof (1.29); 3         BigDecimal b=bigdecimal.valueof (0.41); 4         System.out.println (a.subtract (b)); 5     }

The final result is also the result we need:

This is a long time to see ...

　　

In Java, if you need an accurate calculation answer, avoid using double type and float type