note 5 二分法求平方根,素数,回文数
+二分法求平方根
x = float(raw_input('Enter the number'))
low = 0
high = x
guess = (low + high ) / 2
if x < 0:
print 'Number Error'
while abs(guess**2 - x) > 1e-5:
if guess**2 < x:
low = guess
else:
high = guess
guess = (low + high) / 2
print 'The root of is',guess
+素数
前50个
import math
count = 0
num = 2
while count < 50:
for i in range(2,int(math.sqrt(num)) + 1):
if num % i == 0:
break
else:
print x,'is a prime!'
count += 1
num += 1
+回文数
num = 12321
num_p = 0
num_temp = num
while num != 0:
num_p = num_p * 10 + num % 10
num /= 10
if num_temp == num_p:
print 'OK'
else:
print 'NO'
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