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StringtoInteger.py
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StringtoInteger.py
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class Solution(object):
def myAtoi(self, str):
"""
:type str: str
:rtype: int
"""
sum = 0
dight = 1
count = 0
INT_MAX = 2147483647
INT_MIN = -2147483648
str = str.strip()
if (len(str)==0):
return 0
if (str[0] == '-'):
dight = -1
count = 1
if (str[0] == '+'):
dight = 1
count = 1
for i in range(count,len(str)):
num = ord(str[i])-ord('0')
if(num>=10 or num<0):
break
sum = sum*10+num
if int.bit_length(sum)>32:
break
if(int.bit_length(sum*dight)<32):
return sum*dight
else:
if(dight>0):
return INT_MAX
else:
return INT_MIN
if __name__ == '__main__':
s = Solution()
print s.myAtoi("+1")
print s.myAtoi("+123")
print s.myAtoi("-123 ")
print s.myAtoi(" -123 ")
print s.myAtoi(" -12 3 ")
print s.myAtoi(" -0012a42")
print s.myAtoi(" +-2")
print s.myAtoi(" -+2")
print s.myAtoi("2147483648")
print s.myAtoi("-2147483647")
print s.myAtoi("9223372036854775809")