After you enter a QP problem, whether interactively or by reading a formatted file, you can then save the problem in a formatted file. The formats available to you are LP, MPS, and SAV. When you save a QP problem in one of these formats, the quadratic information will also be recorded in the formatted file.

In addition, you can save the quadratic part of a problem in a QP file (a formatted file with the extension .qp). To do so:

• In the Interactive Optimizer, use the write command
• In the Callable Library, use the routine CPXqpwrite().
• Writing a QP format file is not supported by IloCplex.