3 files changed, 5 insertions, 5 deletions
diff --git a/include/brain/neural_network.h b/include/brain/neural_network.h
index 99e5f60..37eb3a1 100644
--- a/include/brain/neural_network.h
+++ b/include/brain/neural_network.h
@@ -15,8 +15,8 @@ public:
     void setInput(int inputIndex, double activation);
     int findMaxOutputIndex();
 
-    int numberOfSensors();
-    int numberOfOutputs();
+    int numberOfSensors() { return _sensors.size(); }
+    int numberOfOutputs() { return _outputs.size(); }
 	
 private:
     std::vector<std::shared_ptr<NeuralNode>> _nodes;
diff --git a/include/brain/neuron.h b/include/brain/neuron.h
index 1878752..27d7202 100644
--- a/include/brain/neuron.h
+++ b/include/brain/neuron.h
@@ -9,7 +9,7 @@
 class Neuron : public NeuralNode
 {
 public:
-    virtual double activation();
+    virtual double activation() {}
 
 private:
     std::vector<std::shared_ptr<NeuralLink>> _inputLinks;
diff --git a/include/brain/sensor.h b/include/brain/sensor.h
index cdee218..06b96d0 100644
--- a/include/brain/sensor.h
+++ b/include/brain/sensor.h
@@ -8,6 +8,6 @@ private:
     double _activation;
     
 public:
-    void setActivation(double activation);
-    virtual double activation();
+    void setActivation(double activation) { _activation = activation; }
+    virtual double activation() { return _activation; }
 };