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The routine CPXinfodblparam is used to obtain the default,
 minimum, and maximum values of a CPLEX parameter of type double.
double indicate that the parameter has no limit.The reference manual ILOG CPLEX Parameters, provides a list of parameters with their types, options, and default values.
Example
 status = CPXinfodblparam (env, CPX_PARAM_TILIM, &default_tilim,
                           &min_tilim, &max_tilim);
 | env | A pointer to the CPLEX environment as returned by   | 
| whichparam | The symbolic constant (or reference number) of the parameter value to be obtained.  | 
| defvalue_p | A pointer to a variable of type   | 
| minvalue_p | A pointer to a variable of type   | 
| maxvalue_p | A pointer to a variable of type   |