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0.1+0.2
-->
0.30000000000000004

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0.1 + 0.2 == 0.3
-->
False

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import numpy as np
import struct
def binary_add(a, b, pre_num=64):
    int_a = np.floor(a).astype('int64')
    int_b = np.floor(b).astype('int64')
    int_sum = int_a + int_b
    double_a = ""
    double_b = ""
    r_a = a - int_a
    r_b = b - int_b
    temp_a = r_a
    temp_b = r_b
    def up(num):
        t = num * 2
        if t >= 1:
            x = 1
            t -= 1
        else:
            x = 0
        return t, x
    for index in range(pre_num):
        temp_a, bin_a = up(temp_a)
        temp_b, bin_b = up(temp_b)
        double_a = double_a + str(bin_a)
        double_b = double_b + str(bin_b)
    print(double_a)
    print(double_b)
    sum2 = int(double_a, 2) + int(double_b, 2)
    sum_bin = bin(sum2)[2:]
    print(sum_bin)
    res_p = sum2 / 2 ** 64
    return res_p + int_sum
res = binary_add(0.1, 0.2)
print(res)
pass
-->
0001100110011001100110011001100110011001100110011001101000000000
0011001100110011001100110011001100110011001100110011010000000000
0100110011001100110011001100110011001100110011001100111000000000
0.30000000000000004