get first to characters of line c++ code example

Example 1: swap first and last character of string in c++

std::swap(str.front(), str.back());

Example 2: c++ first letter of string

// string::at
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Test string");
  for (unsigned i=0; i<str.length(); ++i)
  {
    std::cout << str.at(i);
  }
  return 0;
}