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  1. #!/usr/bin/python
  2. # coding:utf-8
  3. from __future__ import print_function, unicode_literals
  4. import sys
  5.  
  6.  
  7. N = 0.01
  8.  
  9.  
  10. def main():
  11.     # input
  12.     print("Input a number for square root calculation.")
  13.     try:
  14.         input = sys.stdin.readline().strip("\n")
  15.     except KeyboardInterrupt:
  16.         sys.exit()
  17.     try:
  18.         input = float(input)
  19.     except ValueError:
  20.         sys.exit("input error")
  21.  
  22.     # calculate and output
  23.     print("loop: "+str(sb_sqrt(input)))
  24.     print("recursive: "+str(sb_sqrt2(input)))
  25.  
  26.  
  27. def sb_sqrt(target):
  28.     """square root calculation by loop.
  29.     """
  30.     r = N
  31.     while r * r < target:
  32.         r += N
  33.     # r -= N
  34.  
  35.     return r
  36.  
  37.  
  38. def sb_sqrt2(target):
  39.     """square root calculation by recursive and clojure.
  40.     """
  41.     def _(r):
  42.         # print("deb1:"+str(r))
  43.         if r * r < target:
  44.             # print("deb2:"+str(r))
  45.             return _(r+N)
  46.             # print("deb3:"+str(r))
  47.         else:
  48.             # print("deb4:"+str(r))
  49.             return r
  50.  
  51.     return _(N)
  52.  
  53.  
  54. if __name__ == "__main__":
  55.     main()
  56.  
Success #stdin #stdout 0.01s 6652KB
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10.0
stdout
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Input a number for square root calculation.
loop: 3.17
recursive: 3.17
https://ideone.com/xzWcs
language:
Python (cpython 2.7.16)
created:
14 years ago
visibility:
public

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