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The routine CPXinfostrparam is used to obtain the default
 value of a CPLEX string parameter
Example
status = CPXinfostrparam (env, CPX_PARAM_NODEFILEDIR, defdirname);
| env | A pointer to the CPLEX environment as returned by   | 
| whichparam | The symbolic constant (or reference number) of the parameter for which the default value is to be obtained.  | 
| defvalue_str | A pointer to a buffer of length at least   |