How do I solve this code coach problem?

Question

How do I solve this while loop related problems kf code coach. This is the problem :

The given program calculates and outputs the number of digits in a given number using a while loop.

n = int(input())
length = 0
while n > 0:
n //= 10
length += 1

print(length)

During each iteration, the loop uses floor division to divide the given number by 10, thus dropping one digit.
The process continues until the number has no more digits (n>0).

You need to change the code to calculate and output the sum of all digits of the input number.

Sample Input
643

Sample Output
13

Explanation
The sum of the digits of 643 is 6+4+3 = 13.

Hint: You can get each digit of the number by modulo dividing (%) it by 10 during each iteration.

I tried this but this is not working :
n = int(input())

length = 0

while n>0:
x = n%10
length += n
print (length)

Answer 1

You are giving n last digit to x then adding whole n to length
Which wouldn't work.
Also you are not changing n value so it will loop forever.

Right Code:
n = int(input())
sum = 0

while n > 0:
sum += n%10 #Add last number
n //= 10 #remove last number

print(sum)

Hope It Helps You 😊

Answer 2

fun main(args: Array<String>) {
var num = readLine()!!.toInt()
var x = 0
while (num>0) {
x=x+num%10
num=num/10
}
println(x)
}

Answer 3

I didn't use the while loop for this code and
the code worked with the same but I made a different script.

fun main(args: Array<String>) {
var num = readLine()!!.toInt()
var hundred = (num - (num % 100)) / 100
var one = num % 10
var ten = (num % 100 - num % 10) / 10
var sum_parts = hundred + one + ten
println(sum_parts)
}

Answer 4

#the best way:
# while Loops(sum of digit)
n = int(input())
digits = [int(d) for d in str(n)]
print(sum(digits))

Answer 5

n = int(input())

sum = 0

while n > 0:
n, reminder = divmod(n, 10)
sum += reminder

print(sum)

Answer 6

Let’s save some time by creating a program to do the calculation for you!

Take a number N as input and output the sum of all numbers from 1 to N (including N).

Sample Input
100

Sample Output
5050

Explanation: The sum of all numbers from 1 to 100 is equal to 5050.

Answer 7

Sum of Consecutive Numbers

No one likes homework, but your math teacher has given you an assignment to find the sum of the first N numbers.

Let’s save some time by creating a program to do the calculation for you!

Take a number N as input and output the sum of all numbers from 1 to N (including N).

Sample Input
100

Sample Output
5050

Answer 8

change value for n:
From 643 you get 3 by n%10 but next you need 4. (hint from 64)
But your code always get only 3
Hint:
Solution is already in the question's 1st part...