Summation of a character

I was working on Cody Problem 74 where I found examples like:

sum('13') = 100
sum('22') = 100
sum('123456') = 309

I wonder how it works here, i.e., sums a character but returns a double.

Thanks in advance.

Answer 1

[Stephen23]

Take a look at the character codes, e.g.:

>> double('13')
ans =
   49   51

The function sum simply sums up the character codes:

https://en.wikipedia.org/wiki/ASCII#Printable_characters

Answer 2

[KSSV]

Read about uint16. This will convert the characters into numeric codes. When you use sum on the characters, they will be converted to uint16 numbers and gets summed up. Check below code.

a = uint16('13')  ; 
b = uint16('22')  ;
c = uint16('123456') ; 

In the above sum(a) and sum('13') are same.