Initialization

Xpress NonLinear and Xpress Optimizer both need to be initialized, and an empty problem created. All Xpress NonLinear functions return a code indicating whether the function completed successfully. A non-zero value indicates an error. For ease of reading, we have for the most part omitted the tests on the return codes, but a well-written program should always test the values.

XPRSprob mprob;
XSLPprob sprob;

if (ReturnValue=XPRSinit(NULL)) goto ErrorReturn;
if (ReturnValue=XSLPinit()) goto ErrorReturn;
if (ReturnValue=XPRScreateprob(&mprob)) goto ErrorReturn;
if (ReturnValue=XSLPcreateprob(&sprob, &mprob)) goto ErrorReturn;