Mathematical Programming basics

model "Chess 1"
 uses "mmxprs"                    ! Use Xpress Optimizer for solving

 declarations
  xs, xl: mpvar                   ! Decision variables
 end-declarations

 Time:= 3*xs + 2*xl <= 160        ! Constraint: limit on working hours
 Wood:= xs + 3*xl <= 200          ! Constraint: raw mat. availability

 xs is_integer; xl is_integer     ! Integrality constraints

 maximize(5*xs + 20*xl)           ! Objective: maximize total profit

 writeln("Solution: ", getobjval) ! Print objective function value

 writeln("small: ", getsol(xs))   ! Print solution for xs
 writeln("large: ", getsol(xl))   ! and xl

 write("Time: ", getact(Time))    ! Constraint activity
 writeln(" ", getslack(Time))     ! and slack

end-model

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