Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Write a Python program that takes the value of n from the user and
calculates the value of S using the following equation:
S = 1! - 2! + 3! - 4! + 5! - 6! + …….. n!
Here, the value of n should be a positive (n>0) integer. If the user gives
a negative input or zero, then print “Invalid Input!”. Also, print the
sentence “End of program.” in the last line no matter what the input is.
---------------------------------------------------------------------
Sample Input 1:
4
Sample Output 1:
Value of S is: -19
End of program.
---------------------------------------------------------------------
Sample Input 2:
11
Sample Output 2:
The value of S is: 36614981
End of program.
---------------------------------------------------------------------
Sample Input 3:
-4
Sample Output 3:
Invalid Input!
End of program.
---------------------------------------------------------------------
Explanation/Hints:
You may import the ‘math’ module and use the built-in math.factorial()
function in this problem. Alternatively, if you use a nested loop, the
equation of S can be rewritten as follows:
S = 1 - (12) + (123) - (1234) + …….. (123….*n)
For Sample Input 1 & 2, if you simply implement the given equation in your
code, you will get the desired values. For Sample Input 3, as the input is
negative, the corresponding output is displayed. The sentence “End of
program.” is displayed every time.
need the solve asap plz
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