import pandas as pd
import math


def dec_mantissa(bin_mantissa):
    res = 0
    for k in range(len(bin_mantissa)):
        res = res + (int(bin_mantissa[k]) * (2 ** (-1 - k)))
    return res


def hex2dec(hex):
    binary = "{0:08b}".format(int(hex, 16))
    if len(binary) < 16:
        while len(binary) < 16:
            binary = "0" + binary
        sign = 1
    else:
        sign = -1 ** int(binary[0])
    exp = 2 ** (int(binary[1:6], 2) - 16)
    mantissa = 1 + dec_mantissa(binary[6:])
    return [binary, sign * exp * mantissa]


# df = pd.read_csv("fp16_test.hex")
# bins = []
# decs = []
# for i in range(df.shape[0]):
#     hexs = df.iloc[i][0].split()
#     bins.append([])
#     decs.append([])
#     for j in range(4):
#         bins[i].append("{0:08b}".format(int(hexs[j], 16)))
#         exp = 2 ** (int(bins[i][j][1:6], 2) - 16)
#         sign = -1 ** int(bins[i][j][0])
#         mantissa = 1 + dec_mantissa(bins[i][j][6:])
#         decs[i].append(sign * exp * mantissa)
input_1 = "bbeb"
input_2 = "58fe"
result = "d8f1"
calc_res = "d9f1"

print("input 1 :", input_1, ", ", hex2dec(input_1)[0], ", ", hex2dec(input_1)[1])
print("input 2 :", input_2, ", ", hex2dec(input_2)[0], ", ", hex2dec(input_2)[1])
print("result  :", result, ", ", hex2dec(result)[0], ", ", hex2dec(result)[1])
print("calc res:", calc_res, ", ", hex2dec(calc_res)[0], ", ", hex2dec(calc_res)[1])