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The routine CPXgetparamnum returns the reference number of
 a CPLEX parameter, given a character string containing the name for it.
The reference manual ILOG CPLEX Parameters provides a list of parameters with their types, options, and default values.
Example
status = CPXgetparamnum (env, "CPX_PARAM_ADVIND", param_number);
| env | A pointer to the CPLEX environment as returned by   | 
| name_str | A character array containing the name of the target parameter.  | 
| whichparam_p | A pointer to an integer to receive the reference number.  |