55 lines
1.1 KiB
Python
55 lines
1.1 KiB
Python
|
def bin2hex(s):
|
||
|
|
ht = [ str(i) for i in range(10) ] + [ "A","B","C","D","E","F" ]
|
||
|
|
h = ""
|
||
|
|
while s != "":
|
||
|
|
h = ht[int(s[-4:],2)] + h
|
||
|
|
s = s[:-4]
|
||
|
|
return "0x"+h
|
||
|
|
|
||
|
|
def to_mantisse(d,n=23):
|
||
|
|
s = ""
|
||
|
|
for i in range(n):
|
||
|
|
d *= 2
|
||
|
|
s += str(int(d)%2)
|
||
|
|
return s
|
||
|
|
|
||
|
|
def to_binary(d,n=8):
|
||
|
|
s = ""
|
||
|
|
for i in range(n):
|
||
|
|
s = str(d & 1) + s
|
||
|
|
d = d >> 1
|
||
|
|
return s
|
||
|
|
|
||
|
|
def to_ieee754(d,el,ml):
|
||
|
|
if d < 0:
|
||
|
|
s = 1
|
||
|
|
d *= -1
|
||
|
|
else:
|
||
|
|
s = 0
|
||
|
|
g = 0
|
||
|
|
while d >= 2:
|
||
|
|
d /= 2
|
||
|
|
g += 1
|
||
|
|
while d <= 0.5:
|
||
|
|
d *= 2
|
||
|
|
g -= 1
|
||
|
|
bias = 2**(el-1)-1
|
||
|
|
e = g+bias
|
||
|
|
return str(s)+to_binary(e,n=el)+to_mantisse(d,n=ml)
|
||
|
|
|
||
|
|
def to_ieee754_single(d):
|
||
|
|
return to_ieee754(d,el=8,ml=23)
|
||
|
|
|
||
|
|
def to_ieee754_double(d):
|
||
|
|
return to_ieee754(d,el=11,ml=52)
|
||
|
|
|
||
|
|
def to_ieee754_single_hex(d):
|
||
|
|
return bin2hex(to_ieee754_single(d))
|
||
|
|
|
||
|
|
def to_ieee754_double_hex(d):
|
||
|
|
return bin2hex(to_ieee754_double(d))
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
print(bin2hex(to_ieee754_double(-2.5)))
|
||
|
|
print(bin2hex(to_ieee754_double(-1.75)))
|