The exp node returns the exponetial e to the power of the value of its child-node.

- Minimum number of child-nodes: 1
- Maximum number of child-nodes: 1
- Valid input range: no constraints, but results may under or overflow.

The exp node's value is calculated by raising e to the power of the value of its child-node.

value = e^{x} , where x is the value of the child-node