If you try to access, for example, an integer as though it were a string, would you not receive an error code? Couldn't you capture the error and use it to determine whether or not the variable can be accessed in that way? For example, say you have an integer variable containing the number "1". You try to append the string "test" to it, and receive an error. You therefore know that it's not a string variable and move on to the next variable type: integer. You attempt to increase the variable by one. This is successful, so you know it's an integer.
I don't know anything about C so please tell me if this is gibberish :-)
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moto
