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### mip1_vb.vb

' Copyright 2016, Gurobi Optimization, Inc.
'
' This example formulates and solves the following simple MIP model:
'
'    maximize    x +   y + 2 z
'    subject to  x + 2 y + 3 z <= 4
'                x +   y       >= 1
'    x, y, z binary

Imports System
Imports Gurobi

Class mip1_vb
Shared Sub Main()
Try
Dim env As GRBEnv = New GRBEnv("mip1.log")
Dim model As GRBModel = New GRBModel(env)

' Create variables

Dim x As GRBVar = model.AddVar(0.0, 1.0, 0.0, GRB.BINARY, "x")
Dim y As GRBVar = model.AddVar(0.0, 1.0, 0.0, GRB.BINARY, "y")
Dim z As GRBVar = model.AddVar(0.0, 1.0, 0.0, GRB.BINARY, "z")

' Integrate new variables

model.Update()

' Set objective: maximize x + y + 2 z

model.SetObjective(x + y + 2 * z, GRB.MAXIMIZE)

' Add constraint: x + 2 y + 3 z <= 4

model.AddConstr(x + 2 * y + 3 * z <= 4.0, "c0")

' Add constraint: x + y >= 1

model.AddConstr(x + 2 * y + 3 * z <= 4.0, "c1")

' Optimize model

model.Optimize()

Console.WriteLine(x.Get(GRB.StringAttr.VarName) & " " & _
x.Get(GRB.DoubleAttr.X))
Console.WriteLine(y.Get(GRB.StringAttr.VarName) & " " & _
y.Get(GRB.DoubleAttr.X))
Console.WriteLine(z.Get(GRB.StringAttr.VarName) & " " & _
z.Get(GRB.DoubleAttr.X))

Console.WriteLine("Obj: " & model.Get(GRB.DoubleAttr.ObjVal))

' Dispose of model and env

model.Dispose()
env.Dispose()

Catch e As GRBException
Console.WriteLine("Error code: " & e.ErrorCode & ". " & e.Message)
End Try
End Sub
End Class


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