Please explain this answer

Question

https://www.sololearn.com/post/1056771/?ref=app

Answer 1

s = starting address of the string stored in it. Let's say it is x

p = s (initially) = x
while(*p++); means p will run through the entire length of the string until it reaches end of string '\0'

therefore, now p = starting address + length of string + 1 (due to '\0')

p = x + 8 + 1
p = x + 9

therefore, p - s = x + 9 - x = 9

Answer 2

Hey Infinity thanks for this good explanation !

Answer 3

you're welcome