str1 . str2                   Concatenation
    str1 str2                Concatenation

    Placing  two  strings  or  variables  or  a  string  and  a variable in
    conjunction in an expression will  force their concatenation to form  a
    single  string.    The  concatenation  operator, ., ASCII character 239
    (0xef) has been created in QTAwk to make explicit string concatenation.

    Thus:

    "The first" "string" ==> "The first string"

    or

    "The first" . "string" ==> "The first string"

    If:

      vstr = "the Numerical value: ";

    and

      vn = 100.89123;

    then:

        vstr vn ==> "the numerical value: 100.891"

    or

        vstr . vn ==> "the numerical value: 100.891"

    Note that the numerical  output format, OFMT =  "%6g", has been used  to
    convert vn to a string before the concatenation operation is performed.

    Concatenation can be used to force any variable explicitly to a  string
    value.  Concatenating with the null string will leave the value of  the
    variable essentially unchanged.