can I access a character in a string in c++ code example

Example 1: find character in string c++

auto char_to_find = 'a'
if (str.find(char_to_find) != std::string::npos) {
    // character found
}

Example 2: c++ get character from string

#include <iostream>
#include <string>

int main() {
    std::string myStr = "test string";

    for (int i = 0; i < myStr.length(); ++i) {
        std::cout << myStr.at(i) << std::endl;
    }

    return 0;
}