How to realize the Sum of factorials in Python
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code implementation
Sum=0factorial=1num = int(input ('please input a number'))for i in range(1,num+1): factorial = factorial*i print ('output loop factorial intermediate process value', factorial) Sum +=factorialprint ('sum of factorial: ',Sum)
Output:
Please enter a number: 5
Intermediate process value of output loop factorial value: 1
Intermediate process value of output loop factorial value: 2
Intermediate process value of output loop factorial value: 6
Intermediate process value of output loop factorial value: 24
Intermediate process value of output loop factorial value: 120
Sum of factorial: 153
program analysis
Factorial: Also a term used in mathematics; factorial refers to the multiplication of 1 by 2 by 3 by 4 up to the desired number; when expressing factorial, use "! "To show. If h factorial, then h!; Factorial is generally difficult to calculate because the products are large.
The sum of factorial, i.e. the sum of all factorial of numbers before h
Line 1 and line 2 initialize variables, Sum is used to record the sum of factorial, factorial is used to record the value of factorial
Line 3 of the program prompts the user to enter the number of factorial sums required
Lines 4 through 7 sum factorial products through a for loop. Line 4, the range(1,num+1) of the for loop limits the factorial range from 1 to num, line 5 records the factorial of the variable i, factorial always records the factorial of i-1, line 6 deliberately outputs the middle of the factorial value, and line 7 records the sum of factorial values from 1 to num. Finally, the program outputs the sum of factorial.
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