#Write the Algorithm to find the Sum of digits of the number.

1. Start
2. Let the number be x, Variable a for Reminder,r for result  
3. Initialize variable r=0  
4. Condition (x!=0)  
   1. a=x%10
   2. r=r+a
   3. x=x/10 goto Step 4
5. Display Result r 
6. Stop

#Program to find Sum of Digits of a Numbers using Using While loop

r=0
print("Enter the number")
n=int(input())
while n!=0:
 a = n% 10
 r=r+ a
 n=n//10
print("Sum of Digits is: ",r)

Output:

#Sum of digits of  a Number Using Recursion

n= int(input("Enter the Choice"))
r=0
def sum(n):
 global r # We can use it out of the function
 if (n > 0):
  a= n % 10
  r= r+ a
  sum(n // 10)
 return r


r=sum(n)
print("Sum of digits is =",r)

Output: