int object is not iterable while trying to sum the digits of a number?

Question

I have this code:

inp = int(input("Enter a number:"))  for i in inp:     n = n + i;     print (n) 

but it throws an error: 'int' object is not iterable

I wanted to find out the total by adding each digit, for eg, 110. 1 + 1 + 0 = 2. How do I do that?

Answer 1

First, lose that call to int - you're converting a string of characters to an integer, which isn't what you want (you want to treat each character as its own number). Change:

inp = int(input("Enter a number:")) 

to:

inp = input("Enter a number:") 

Now that inp is a string of digits, you can loop over it, digit by digit.

Next, assign some initial value to n -- as you code stands right now, you'll get a NameError since you never initialize it. Presumably you want n = 0 before the for loop.

Next, consider the difference between a character and an integer again. You now have:

n = n + i; 

which, besides the unnecessary semicolon (Python is an indentation-based syntax), is trying to sum the character i to the integer n -- that won't work! So, this becomes

n = n + int(i) 

to turn character '7' into integer 7, and so forth.