#include <iostream> #include <string> using namespace std; int main() { string myString = "Hello"; cout << "Original string: " << myString << "\n"; cout << "First character: " << myString.at(0) << "\n"; cout << "Second character: " << myString.at(1) << "\n"; cout << "Last character: " << myString.at(myString.length() - 1) << "\n"; myString.at(0) = 'J'; cout << "Changed string: " << myString; return 0; }