The following examples are discussed in detail in the 'BCL User Guide and Reference Manual':

• modeling and solving a small MIP scheduling problem (xbexpl1.c version BASIC)
• using variable arrays and constraint templates (xbexpl1.c versions ARRAY and ARRAYC)
• definition of SOS-1 (xbexpl1 version SOS)
• data input from file, index sets (xbexpl1i)
• user error handling, output redirection (xbexpl3)
• solving multiple scenarios of a transportation problem in parallel (xbexpl2: standard, single thread version; xbscenar: defining multiple problems, each in a separate thread)
• cut generation / adding cuts at MIP tree nodes (xbcutex)
• quadratic programming (quadratic objective: xbqpr12, quadratic constraints: xbairport)
• combine BCL problem input with problem solving in Xpress Optimizer (xbcontr1)
• use an Xpress Optimizer solution callback with a BCL model (xbcontr2s: single MIP thread; xbcontr2: multiple MIP threads)

Further explanation of this example: 'BCL Reference Manual', Appendix B Using BCL with the Optimizer library

ABC14, 3
DE45F, 4
GH9IJ99, 2 
KLMN789, 2