Data types at run time

[David Marks]

Does anyone know how to determine the data type of a variable at runtime?

I am trying to write some code that will convert the value of a variable
to string without knowing a priori its data type. The function will be passed
a pointer to the variable. How can this function determine the variable's
data type. The only thing I DO know is that this variable will never be
a structure or a union; it CAN be any numeric (including float and double) or 
character (including string) type;

Please send e-mail and I will summarize to the net.

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