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The routine CPXgetdblparam is used to obtain the current
 value of a CPLEX parameter of type double.
The reference manual ILOG CPLEX Parameters provides a list of parameters with their types, options, and default values.
Example
status = CPXgetdblparam (env, CPX_PARAM_TILIM, &curtilim);
| env | A pointer to the CPLEX environment as returned by   | 
| whichparam | The symbolic constant (or reference number) of the parameter for which the value is to be obtained.  | 
| value_p | A pointer to a variable of type   |