How to define non negative decision variables in CPLEX?

Question

Xijcp,Yjkp,Zklp,Wlmp,Amjp,Bmdp,Ddcp, Edrcp, Frjcp greater than or equal to zero for all i,j,k,l,m,d, r, c, p Hjp,Gkp equal to zero or 1 for all j,k,p

Answer 1

If you define your decision variable as:

dvar float Xijcp; --> it can take both negative and positive values.

For greater than equal to zero, you can define as

dvar float+ Xijcp;

For binary variables

dvar boolean Xijcp;