Символы \r, \n и \r\n

#include <iostream>
 
int main()
{
 
    //----------------------------------------------
    unsigned char sym[3];
 
    sym[0] = '\r\n';
    sym[1] = '\r';
    sym[2] = '\n';
 
    std::cout << (int)sym[0] << std::endl;
    std::cout << (int)sym[1] << std::endl;
    std::cout << (int)sym[2] << std::endl;
    //----------------------------------------------
 
 
 
    std::string my_string0 = "Hello";
    std::string my_string1 = "Hello";
    std::string my_string2 = "Hello";
    std::string my_string3 = "Hello";
 
 
    my_string0.push_back('\r');
    my_string0.push_back('\n');
 
 
    my_string1.push_back('\r\n');
    my_string2.push_back('\r');
    my_string3.push_back('\n');
 
 
 
    my_string0 = my_string0 + "1";
    my_string1 = my_string1 + "1";
    my_string2 = my_string2 + "1";
    my_string3 = my_string3 + "1";
    
 
    std::cout << my_string0 << std::endl;
    std::cout << my_string1 << std::endl;
    std::cout << my_string2 << std::endl;
    std::cout << my_string3 << std::endl;
}

char c = '\r\n';

int a = 'abc';

#include <iostream>
 
int main()
{
    int j = 'abcd';
    int i = 0x61626364;
 
    std::cout << ( j == i );
 
    return 0;
}

enum state { waiting = 'wait', running = 'run.', stopped = 'stop' };

typedef mpl::string<'hell','o wo','rld'> hello;
typedef mpl::push_back<hello, mpl::char_<'!'> >::type hello2;
 
BOOST_ASSERT(0 == std::strcmp(mpl::c_str<hello2>::value, "hello world!"));