4 files changed, 74 insertions, 0 deletions
diff --git a/src/jcgp/function/Addition.java b/src/jcgp/function/Addition.java
new file mode 100644
index 0000000..7dc17e2
--- /dev/null
+++ b/src/jcgp/function/Addition.java
@@ -0,0 +1,18 @@
+package jcgp.function;
+
+import jcgp.population.Connection;
+
+public class Addition extends Function {
+
+	@Override
+	public int run(Connection... connections) {
+		int sum = 0;
+		if (connections.length > 0) {
+			for (int i = 0; i < connections.length; i++) {
+				sum += connections[i].evaluate();
+			}
+		}
+		return sum;
+	}
+
+}
diff --git a/src/jcgp/function/Function.java b/src/jcgp/function/Function.java
new file mode 100644
index 0000000..0f0d8a3
--- /dev/null
+++ b/src/jcgp/function/Function.java
@@ -0,0 +1,9 @@
+package jcgp.function;
+
+import jcgp.population.Connection;
+
+public abstract class Function {
+
+	public abstract int run(Connection ... connections);
+	
+}
diff --git a/src/jcgp/function/FunctionSet.java b/src/jcgp/function/FunctionSet.java
new file mode 100644
index 0000000..e2d04a0
--- /dev/null
+++ b/src/jcgp/function/FunctionSet.java
@@ -0,0 +1,31 @@
+package jcgp.function;
+
+import java.util.ArrayList;
+
+
+public class FunctionSet {
+		private ArrayList<Function> functionList;
+		
+		public void setFunctions(Function ... functions) {
+			functionList = new ArrayList<Function>(functions.length);
+			
+			for (int i = 0; i < functions.length; i++) {
+				functionList.add(functions[i]);
+			}
+		}
+		
+		public void addFunction(Function newFunction) {
+			if (functionList == null) {
+				functionList = new ArrayList<Function>();
+			}
+			functionList.add(newFunction);
+		}
+		
+		public int getFunctionCount() {
+			return functionList.size();
+		}
+		
+		public Function getFunction(int index) {
+			return functionList.get(index);
+		}
+	}
+\ No newline at end of file
diff --git a/src/jcgp/function/Subtraction.java b/src/jcgp/function/Subtraction.java
new file mode 100644
index 0000000..70297c3
--- /dev/null
+++ b/src/jcgp/function/Subtraction.java
@@ -0,0 +1,16 @@
+package jcgp.function;
+
+import jcgp.population.Connection;
+
+public class Subtraction extends Function {
+
+	@Override
+	public int run(Connection... connections) {
+		int subtraction = 0;
+		if (connections.length > 1) {
+			subtraction = connections[0].evaluate() - connections[1].evaluate();
+		}
+		return subtraction;
+	}
+
+}