ILOG CPLEX 11.0 User's Manual

Example: Using Query Routines lpex7.cThis example uses the ILOG CPLEX Callable Library query routine CPXgetcolname to getthe column names from a problem object. To do so, it applies the programming pattern justoutlined in Using Surplus Arguments for Array Allocations on page 128. It derives from theexample lpex2.c from the ILOG CPLEX Getting Started manual. This query-routineexample differs from that simpler example in several ways:◆The example calls CPXgetcolname twice after optimization: the first call discovers howmuch space to allocate to hold the names; the second call gets the names and stores themin the arrays cur_colname and cur_colnamestore.◆ When the example prints its answer, it uses the names as stored in cur_colname. If nonames exist there, the example creates generic names.This example assumes that the current problem has been read from a file byCPXreadcopyprob. You can adapt the example to use other ILOG CPLEX query routinesto get information about any problem read from a file.The complete program lpex7.c appears online in the standard distribution atyourCPLEXinstallation/examples/src.130 ILOG CPLEX 11.0 — USER’ S MANUAL