WHILE LOOP CHANGED question: How do I change the code to calculate and output the sum of all digits of the input number.

Question

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

print(length)

Answer 1

n=int(input())
sum_=0

while n!=0:
sum_+=n%10
n=n//10

print(sum_)

#input : 123
#output : 6

Answer 2

n=10
print((n+1)*n//2)
#print(sum(range(n+1)))

Answer 3

Idk why but this one whooped on me lol