Python Exercise Example 76
Python 100 ExamplesProblem:Write a function: when the input n is even, call the function to calculate 1/2+1/4+...+1/n; when the input n is odd, call the function 1/1+1/3+...+1/n
Program analysis:None.
Program source code:
Example (Python 2.0+)
#!/usr/bin/python
# -*- coding: UTF-8 -*-
def peven(n):
i = 0
s = 0.0
for i in range(2,n + 1,2):
s += 1.0 / i # In Python, integer divided by integer only yields an integer, so the floating point number 1.0 is needed
return s
def podd(n):
s = 0.0
for i in range(1, n + 1,2):
s += 1.0 / i # In Python, integer divided by integer only yields an integer, so the floating point number 1.0 is needed
return s
def dcall(fp,n):
s = fp(n)
return s
if __name__ == '__main__':
n = int(raw_input('input a number:\n'))
if n % 2 == 0:
sum = dcall(peven,n)
else:
sum = dcall(podd,n)
print sum
The output of the above example is:
input a number: 6 0.916666666667Other extensions