This commit is contained in:
7400
2023-11-14 06:58:51 -08:00
parent f706d56218
commit 4baaed9d3c

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test/TestIEEE754.py Executable file
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#!/usr/bin/python3
import struct
from fractions import Fraction
def to_float_binary(value):
# Use 'struct.pack' to pack the value into bytes using IEEE 754 floating-point format
# '>f' specifies big-endian single-precision float. Change to '>d' for double precision.
packed = struct.pack('>f', value)
# Convert the bytes to an integer and then to a binary string
return ''.join(f'{byte:08b}' for byte in packed)
def to_float_bits(number) :
float_bytes = struct.pack('>f', number)
return struct.unpack('>I', float_bytes)[0], float_bytes
def fixedPoint(n, shift) :
if shift >= 0 :
return Fraction(n) * (1<<shift)
else :
return Fraction(n) / (1<<-shift)
number = fixedPoint(0xffffff, 127-23) # Largest number
number = fixedPoint(0x1, -128) # Smallest number
float_int32, float_bytes = to_float_bits(number)
print ("float hex:", float_bytes.hex(), hex(int(number*(1<<128))))
print ("float hex:", hex(float_int32), hex(int(number*(1<<128))))