C++ : how to find a space(" ") in a string?

Question

Hi there.
I'm trying to compare each elements of a string to a space character in order to check if there's a gap (or space). I am doing this by using for loop.

The error has been mentioned inside this minimal code:
https://code.sololearn.com/cWLV1Y10AdjA/?ref=app

Your help will be meaningful to me. So, thanks in advance

EDIT: both answers down below are correct, and they explain what needs to be explained. Problem solved :) thank you very much!!!

Answer 1

A lazy way is: if(your_char<33)

This works, because all the whitespace characters of the ascii table are assembled down there.