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# BfsInstance:var_get(+Var, ++What, -Value)

Obtain information for an individual solver problem variable Var.

Var
  A solver problem variable for the solver associated with BfsInstance
What
  Specification for information wanted (atom)
Value
  Returned value of What

## Description

Retrieve information about solver results related to a particular variable, for the bfs instance BfsInstance. Fails if Var is not a problem variable for BfsInstance. What can take one of the following values:

`optimal_val`
  Returns the floating-point solution for variable Var.

`node_val`
  Returns the floating-point solution for variable Var for the current node in the search tree of this instance.

`type`
  Returns the type real or integer of Var in this instance.

### Exceptions

(6) out of range
  What is not a valid value.