How to convert octave_value to string?

[Tamara Bechtold]

Dear all,
many thanks to your responses so far. Here is my code, that does not 
work properly:

DEFUN_DLD (name, args, ,"[Ar,Br,Cr,HSV] = 
name(A,B,C,r/tol,method,-equil,-job ") {
//note the 4th argument can be either int (I  call it r) or double (I 
call it tol)
//and there should be difference if it is 1 or 1.0 as in each case 
different action should be performed
octave_value_list retval;
//now I want to read-in the arguments and try the following
int r=0;
double tol=0.0
if (args(3).is_integer_type())
{
r= args(3).int_value();
//call to function a(r)
}
if (args(3).is_double_type())
{
tol= args(3).double_value();
//call to funtion b(tol)
}
However the function .is_integer_type() gives always false and the 
function .is_double_type() always true. I think this is because all 
numerical data in Octave are written in double precision. In other 
words, this functions do not do what I want them to.
Hence, I came to the conclusion, that the best would be to somehow turn 
the input arguments into strings and search if there is a dot in it.

Does anybody knows how?
Sincerely
Tamara