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Python script to compute big-digit values.(v2)
#! /usr/local/bin/python3.6
"""
Computation of big-digit values (Ver.2)
"""
import random
import sys
import traceback
class CalcBigDigits:
N_A = 1000
N_B = 996
LIMIT = 4
RANGE = 10**LIMIT
SIZE_A = int((N_A-1) / LIMIT) + 1
SIZE_B = int((N_B-1) / LIMIT) + 1
def __init__(self):
self.a = [random.randrange(self.RANGE) for _ in range(self.SIZE_A)]
self.b = [random.randrange(self.RANGE) for _ in range(self.SIZE_B)]
self.c = random.randrange(self.RANGE)
print("A =")
self.__display(self.a)
print("B =")
self.__display(self.b)
print("C =\n{:04d}\n\n".format(self.c))
def compute_add(self):
""" Addition """
try:
print("A + B =")
self.__display(self.__long_add(self.a, self.b))
except Exception as e:
raise
def compute_sub(self):
""" Subtraction """
try:
print("A - B =")
self.__display(self.__long_sub(self.a, self.b))
except Exception as e:
raise
# 計算 ( 乗算 )
def compute_mul(self):
""" Multiplication """
try:
print("A * C =")
self.__display(self.__long_mul(self.a, self.c))
except Exception as e:
raise
# 計算 ( 除算 )
def compute_div(self):
""" Division """
try:
print("A / C =")
self.__display(self.__long_div(self.a, self.c))
except Exception as e:
raise
def __long_add(self, a, b):
""" Computation of long + long
:param list a
:param list b
:return list z
"""
try:
z = [0 for _ in range(max(len(a), len(b)) + 1)]
for i in range(len(a)):
z[i] = a[i]
for i in range(len(b)):
z[i] += b[i]
if z[i] >= 10**self.LIMIT:
z[i] -= 10**self.LIMIT
z[i + 1] += 1
return z
except Exception as e:
raise
def __long_sub(self, a, b):
""" Computation of long - long
:param list a
:param list b
:return list z
"""
try:
z = [0 for _ in range(max(len(a), len(b)))]
for i in range(len(a)):
z[i] = a[i]
for i in range(len(b)):
z[i] -= b[i]
if z[i] < 0:
z[i] += 10**self.LIMIT
z[i + 1] -= 1
return z
except Exception as e:
raise
def __long_mul(self, a, c):
""" Computation of long * short
:param list a
:param list b
:return list z
"""
try:
z = [0 for _ in range(len(a) + 1)]
for i in range(len(a)):
z[i] += a[i] * c
if z[i] >= 10**self.LIMIT:
z[i + 1] += int(z[i] / 10**self.LIMIT)
z[i] %= 10**self.LIMIT
return z
except Exception as e:
raise
def __long_div(self, a, c):
""" Computation of long / short
:param list a
:param list b
:return list z
"""
try:
z = [0 for _ in range(len(a))]
for i in reversed(range(len(a))):
z[i] += int(a[i] / c)
if i > 0:
a[i - 1] += (a[i] % c) * 10**self.LIMIT
return z
except Exception as e:
raise
def __display(self, s):
""" Display
:param list s
"""
try:
size = len(s)
if s[size - 1] == 0:
size -= 1
for i in reversed(range(size)):
print("{:04d} ".format(s[i]), end="")
if (size - i) % 10 == 0 and i != 0:
print()
print("\n")
except Exception as e:
raise
if __name__ == '__main__':
try:
obj = CalcBigDigits()
obj.compute_add()
obj.compute_sub()
obj.compute_mul()
obj.compute_div()
except Exception as e:
traceback.print_exc()
sys.exit(1)
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