What is it called when you can fill a string with <<< and an end-delimiter?

Question

I know in C++ and in PHP you can fill a string or a file with hard-coded text. If I remember correctly this is how it is supposed to look:

var <<< DELIMITER
   Menu for program X
   1.Add two numbers
   2.Substract two numbers
   3.Multiply two numbers
   Please pick an option from (0-3);
DELIMITER

This can be used for menus or text that remains the same no matter what like a header. But without having to do:

foobar << "Menu for program X" << endl << "1.Add two numbers" << endl << "2.Substract two numbers"

Answer 1

C++ doesn't have any equivalent to PHP's HEREDOC syntax.

You can, however, do this in C++:

cout << "   Menu for program X\n"
        "   1.Add two numbers\n"
        "   2.Substract two numbers\n"
        "   3.Multiply two numbers\n"
        "   Please pick an option from (0-3);" << endl;

Or this in C:

printf( "   Menu for program X\n"
        "   1.Add two numbers\n"
        "   2.Substract two numbers\n"
        "   3.Multiply two numbers\n"
        "   Please pick an option from (0-3);\n" );
fflush(stdout);

Which is directly equivalent to PHP's HEREDOC syntax:

echo <<<EOT
   Menu for program X
   1.Add two numbers
   2.Substract two numbers
   3.Multiply two numbers
   Please pick an option from (0-3);
EOT;

The above syntax for C and C++ is treated by the compiler as one long string, by stitching them together. It has no other effect on the string literal, hence the need for '\n'.