Question

a ccept number from user and calculate the sum of all number from 1 to given number​

Answer 1

Input: n = 5

Output: Sum of digits in numbers from 1 to 5 = 15

Input: n = 12

Output: Sum of digits in numbers from 1 to 12 = 51

Input: n = 328

Output: Sum of digits in numbers from 1 to 328 = 3241

Naive Solution:

A naive solution is to go through every number x from 1 to n and compute the sum in x by traversing all digits of x. Below is the implementation of this idea.

# A Simple Python program to compute sum

# of digits in numbers from 1 to n

# Returns sum of all digits in numbers

# from 1 to n

def sumOfDigitsFrom1ToN(n) :

result = 0 # initialize result

# One by one compute sum of digits

# in every number from 1 to n

for x in range(1, n+1) :

result = result + sumOfDigits(x)

return result

# A utility function to compute sum of

# digits in a given number x

def sumOfDigits(x) :

sum = 0

while (x != 0) :

sum = sum + x % 10

x = x // 10

return sum

# Driver Program

n = 328

print("Sum of digits in numbers from 1 to", n, "is", sumOfDigitsFrom1ToN(n))

Output:

Sum of digits in numbers from 1 to 328 is 3241

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