How can i check characters of a string one by one in C++ ?

Answer 1

If you are on C++11 or later:

std::string mystring = "Hello this is a test!";
for(auto c : mystring){
std::cout << c << std::endl; // Will print out each letter on a new line
}

Answer 2

Use auto& instead though.
or const auto& if you don't plan to modify the characters.
Otherwise you're just making unnecessary copies.

Answer 3

@Dennis for chars it hardly makes a difference. You lose the advantage of not making a copy anyways, because now you will have extra instructions due to the referencing

Answer 4

@aklex
Well
https://stackoverflow.com/questions/15927033/what-is-the-correct-way-of-using-c11s-range-based-for

told me it was better to use const auto&, so I just assumed it was better most of the time.

I did a test and the runtime with and without & were almost identical.

So I'll rather use it with & for consistency.