diff --git a/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/FunctionArgLookup.java b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/FunctionArgLookup.java
index 1098b5c..dd1bbf9 100644
--- a/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/FunctionArgLookup.java
+++ b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/FunctionArgLookup.java
@@ -6,6 +6,7 @@ public class FunctionArgLookup {
         return switch (name) {
             case "Leorio.say" -> 1;
             case "Leorio.listen" -> 0;
+            case "Wing.dump" -> 0;
             default -> 0;
         };
     }
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Leorio.java b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Leorio.java
new file mode 100644
index 0000000..e624ba0
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Leorio.java
@@ -0,0 +1,36 @@
+package com.github.nilstrieb.hunterlang.hllibrary;
+
+import com.github.nilstrieb.hunterlang.interpreter.RuntimeException;
+import com.github.nilstrieb.hunterlang.interpreter.Value;
+import com.github.nilstrieb.hunterlang.lexer.WordType;
+
+import java.io.InputStream;
+import java.io.PrintStream;
+import java.util.Scanner;
+
+public class Leorio {
+
+    public static void say(Value s) {
+        System.out.println(s.toPrintString());
+    }
+
+    public static String listen() {
+        Scanner sc = new Scanner(System.in);
+        return sc.nextLine();
+    }
+
+    public static Value call(String name, Object[] args) throws RuntimeException {
+        switch (name) {
+            case "say" -> {
+                say((Value) args[0]);
+                return new Value();
+            }
+            case "listen" -> {
+                return new Value(listen(), WordType.STRING);
+            }
+            default -> {
+                throw new RuntimeException("function not found");
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Library.java b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Library.java
new file mode 100644
index 0000000..3e4d45b
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Library.java
@@ -0,0 +1,15 @@
+package com.github.nilstrieb.hunterlang.hllibrary;
+
+import com.github.nilstrieb.hunterlang.interpreter.RuntimeException;
+import com.github.nilstrieb.hunterlang.interpreter.Value;
+
+public class Library {
+    public static Object call(String name, Object ... args) throws RuntimeException {
+        String[] parts = name.split("\\.");
+        return switch (parts[0]){
+            case "Leorio" -> Leorio.call(parts[1], args);
+            case "Wing" -> Wing.call(parts[1], args);
+            default -> throw new RuntimeException("Unexpected lib: " + parts[0]);
+        };
+    }
+}
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Wing.java b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Wing.java
new file mode 100644
index 0000000..9c187d9
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/hllibrary/Wing.java
@@ -0,0 +1,30 @@
+package com.github.nilstrieb.hunterlang.hllibrary;
+
+import com.github.nilstrieb.hunterlang.interpreter.Memory;
+import com.github.nilstrieb.hunterlang.interpreter.RuntimeException;
+import com.github.nilstrieb.hunterlang.interpreter.Value;
+import com.github.nilstrieb.hunterlang.lib.ConsoleColors;
+
+import java.util.ArrayList;
+
+public class Wing {
+    public static void dump(Memory m) {
+        ArrayList<Value> list = m.getList();
+        for (int i = 0; i < list.size(); i++) {
+            Value value = list.get(i);
+            System.out.println(ConsoleColors.CYAN + i + ConsoleColors.YELLOW + " " + value + ConsoleColors.RESET);
+        }
+    }
+
+    public static Value call(String name, Object ... args) throws RuntimeException {
+        switch (name) {
+            case "dump" -> {
+                dump((Memory) args[0]);
+                return new Value();
+            }
+            default -> {
+                throw new RuntimeException("function not found");
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Interpreter.java b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Interpreter.java
new file mode 100644
index 0000000..4c12825
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Interpreter.java
@@ -0,0 +1,112 @@
+package com.github.nilstrieb.hunterlang.interpreter;
+
+import com.github.nilstrieb.hunterlang.hllibrary.Library;
+import com.github.nilstrieb.hunterlang.hllibrary.Wing;
+import com.github.nilstrieb.hunterlang.lexer.WordType;
+import com.github.nilstrieb.hunterlang.lib.ConsoleColors;
+import com.github.nilstrieb.hunterlang.parser.ParseTreeBodyNode;
+import com.github.nilstrieb.hunterlang.parser.ParseTreeNode;
+
+import java.io.PrintStream;
+import java.util.ArrayList;
+
+public class Interpreter {
+
+    ArrayList<ParseTreeNode> statements;
+    Memory memory;
+
+    public void start(ArrayList<ParseTreeNode> statementNodes) throws RuntimeException {
+        System.out.println(ConsoleColors.GREEN_BACKGROUND + ConsoleColors.BLACK_BOLD + "------START INTERPRETER------" + ConsoleColors.RESET);
+        interpret(statementNodes);
+        System.out.println(ConsoleColors.GREEN_BACKGROUND + ConsoleColors.BLACK_BOLD + "------STOP INTERPRETER------" + ConsoleColors.RESET);
+    }
+
+    public void interpret(ArrayList<ParseTreeNode> statementNodes) throws RuntimeException {
+
+        statements = statementNodes;
+        memory = new Memory();
+        boolean lastIfTrue = false;
+
+        for (ParseTreeNode statement : statements) {
+            switch (statement.getKey()) {
+                case ASSIGNMENT -> {
+                    ParseTreeNode memoryNode = statement.getChild(0);
+                    ParseTreeNode valueNode = statement.getChild(1);
+
+                    int memoryAdress = evaluateInt(memoryNode.getChild(0));
+                    Value value = evaluate(valueNode);
+
+                    memory.set(memoryAdress, value);
+                    //Wing.dump(memory);
+                }
+                case IF -> {
+                    if(evaluate(statement.getChild(0)).getBoolValue()){
+                        lastIfTrue = true;
+                        interpret(((ParseTreeBodyNode) statement).getStatements());
+                    } else {
+                        lastIfTrue = false;
+                    }
+                }
+                case WANTS -> {
+
+                }
+                case ELSE -> {
+
+                }
+                case LIBFUNCCALL -> {
+                    String call = statement.getValue();
+                    ArrayList<ParseTreeNode> argsNode = statement.getChildren();
+                    ArrayList<Value> args = new ArrayList<>();
+                    for (ParseTreeNode parseTreeNode : argsNode) {
+                        args.add(evaluate(parseTreeNode));
+                    }
+                    if (call.equals("Wing.dump")) {
+                        Library.call(call, memory);
+                    } else {
+                        Library.call(call, args.toArray());
+                    }
+                }
+                default -> {
+                    throw new RuntimeException("illegal statement type: " + statement.getKey());
+                }
+            }
+        }
+    }
+
+    private int evaluateInt(ParseTreeNode parent) {
+        return evaluate(parent).getIntValue();
+    }
+
+    private Value evaluate(ParseTreeNode parent) {
+        switch (parent.getKey()) {
+            case MEMCALL -> {
+                return memory.get(evaluateInt(parent.getChild(0)));
+            }
+            case NUMBER -> {
+                return new Value(parent.getValue(), WordType.NUMBER);
+            }
+            case GTHAN -> {
+                Value v2 = evaluate(parent.getChild(1));
+                int comp = evaluate(parent.getChild(0)).compareTo(v2);
+                return comp > 0 ? new Value(true) : new Value(false);
+            }
+            case LTHAN -> {
+                int comp = evaluate(parent.getChild(0)).compareTo(evaluate(parent.getChild(1)));
+                return comp < 0 ? new Value(true) : new Value(false);
+            }
+            case EQUALS -> {
+                int comp = evaluate(parent.getChild(0)).compareTo(evaluate(parent.getChild(1)));
+                return comp == 0 ? new Value(true) : new Value(false);
+            }
+            case STRING -> {
+                return new Value(parent.getValue(), WordType.STRING);
+            }
+            case BOOL -> {
+                return new Value(parent.getValue(), WordType.BOOL);
+            }
+            default -> {
+                return new Value();
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Memory.java b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Memory.java
new file mode 100644
index 0000000..2f6dc27
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Memory.java
@@ -0,0 +1,35 @@
+package com.github.nilstrieb.hunterlang.interpreter;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+
+public class Memory {
+    private ArrayList<Value> mem;
+
+    public Memory() {
+        mem = new ArrayList<>();
+    }
+
+    public Value get(int i){
+        if(i >= mem.size()){
+            return new Value();
+        } else {
+            return mem.get(i);
+        }
+    }
+
+    public void set(int i, Value v){
+        if(i >= mem.size()){
+            int dif = i - mem.size() + 1;
+            for (int j = 0; j < dif; j++) {
+                mem.add(new Value());
+            }
+        }
+
+        mem.set(i, v);
+    }
+
+    public ArrayList<Value> getList() {
+        return mem;
+    }
+}
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/interpreter/RuntimeException.java b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/RuntimeException.java
new file mode 100644
index 0000000..eae702e
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/RuntimeException.java
@@ -0,0 +1,7 @@
+package com.github.nilstrieb.hunterlang.interpreter;
+
+public class RuntimeException extends Exception {
+    public RuntimeException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Value.java b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Value.java
new file mode 100644
index 0000000..8fe1516
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/interpreter/Value.java
@@ -0,0 +1,106 @@
+package com.github.nilstrieb.hunterlang.interpreter;
+
+import com.github.nilstrieb.hunterlang.lexer.WordType;
+
+public class Value {
+    private Type type;
+    private String stringValue;
+    private int intValue;
+    private double floatValue;
+    private boolean boolValue;
+
+    public Value(String value, WordType tType) {
+        if (tType == WordType.NUMBER && value.matches("\\d+")) {
+            type = Type.INT;
+            fromInt(value);
+        } else if (tType == WordType.NUMBER && value.matches("\\d+.\\d")) {
+            type = Type.FLOAT;
+            fromFloat(value);
+        } else if (tType == WordType.BOOL) {
+            type = Type.BOOL;
+            fromBool(value);
+        } else if (tType == WordType.STRING) {
+            type = Type.STRING;
+            fromString(value);
+        }
+    }
+
+    public Value() {
+        type = Type.INT;
+        fromInt("0");
+    }
+
+    public Value(boolean b) {
+        type = Type.BOOL;
+        fromBool(String.valueOf(b));
+    }
+
+    private void fromInt(String value){
+        intValue = Integer.parseInt(value);
+        stringValue = value;
+        floatValue = intValue;
+        boolValue = intValue != 0;
+    }
+
+    private void fromFloat(String value){
+        floatValue = Double.parseDouble(value);
+        intValue = (int) floatValue;
+        stringValue = value;
+        boolValue = intValue != 0;
+    }
+
+    private void fromBool(String value){
+        boolValue = Boolean.parseBoolean(value);
+        intValue = boolValue ? 1 : 0;
+        floatValue = intValue;
+        stringValue = value;
+    }
+
+    private void fromString(String value){
+        stringValue = value;
+        boolValue = false;
+        intValue = stringValue.length();
+        floatValue = intValue;
+    }
+
+    public String getStringValue() {
+        return stringValue;
+    }
+
+    public int getIntValue() {
+        return intValue;
+    }
+
+    public double getFloatValue() {
+        return floatValue;
+    }
+
+    public boolean isBoolValue() {
+        return boolValue;
+    }
+
+    @Override
+    public String toString() {
+        return stringValue + " " + type;
+    }
+
+    public void setValue(String value){
+
+    }
+
+    public int compareTo(Value v2) {
+        return Double.compare(this.floatValue, v2.floatValue);
+    }
+
+    public String toPrintString() {
+        return stringValue;
+    }
+
+    public boolean getBoolValue() {
+        return boolValue;
+    }
+
+    enum Type {
+        INT, FLOAT, STRING, BOOL
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/lexer/Lexer.java b/src/main/java/com/github/nilstrieb/hunterlang/lexer/Lexer.java
index 6b413c9..bd9e04d 100644
--- a/src/main/java/com/github/nilstrieb/hunterlang/lexer/Lexer.java
+++ b/src/main/java/com/github/nilstrieb/hunterlang/lexer/Lexer.java
@@ -1,5 +1,7 @@
 package com.github.nilstrieb.hunterlang.lexer;
 
+import com.github.nilstrieb.hunterlang.interpreter.Interpreter;
+import com.github.nilstrieb.hunterlang.interpreter.RuntimeException;
 import com.github.nilstrieb.hunterlang.lib.ConsoleColors;
 import com.github.nilstrieb.hunterlang.parser.ParseException;
 import com.github.nilstrieb.hunterlang.parser.ParseTreeNode;
@@ -32,7 +34,7 @@ public class Lexer {
 
     public static final String BOOL_REGEX = "(true|false).*";
     public static final String STRING_REGEX = "^\"(.*)\".*";
-    public static final String NUMBER_REGEX = "^(-?\\d+.?\\d*).*";
+    public static final String NUMBER_REGEX = "^(-?\\d+\\.?\\d*).*";
 
     private ArrayList<LexToken> tokens;
     private ArrayList<LexToken> temp;
@@ -149,58 +151,4 @@ public class Lexer {
         temp.add(new LexToken(type));
     }
 
-    public static void main(String[] args) {
-        Lexer l = new Lexer();
-
-        String assign = """
-                killua70 hunts 3 > 0
-                killua0 hunts 3
-                killua0 hunts -3.4 #hunts nothing
-                killua1 hunts "hallo"
-                #comment""";
-        String ifs = """
-                killua0 hunts 3 > 0
-                Gon wants false {
-                    Leorio does say "false"
-                }
-                wants killua0 > 3 {
-                    Leorio does say "big killua"
-                } got {
-                    Leorio does say "small killua"
-                }
-                Gon wants true {
-                    Gon wants true {
-                        Leorio does say "that is actually very true"
-                    }
-                }
-                """;
-        String ifif = """
-                Gon wants true {
-                    Gon wants true {
-                        Leorio does say "hallo"
-                    }
-                }
-                """;
-        String sif = """
-                Gon wants true {
-                    Leorio does say "hallo"
-                }
-                """;
-        String hierarchy = """
-                killua0 hunts 3 > 3
-                """;
-
-        ArrayList<LexToken> tokens = l.lex(ifs);
-
-        Parser p = new Parser();
-        try {
-            ArrayList<ParseTreeNode> nodes = p.parse(tokens);
-
-            for (ParseTreeNode parseTreeNode : nodes) {
-                System.out.println(parseTreeNode);
-            }
-        } catch (ParseException e) {
-            e.printStackTrace();
-        }
-    }
 }
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/parser/ParseTreeNode.java b/src/main/java/com/github/nilstrieb/hunterlang/parser/ParseTreeNode.java
index 16b0fc7..d8d344f 100644
--- a/src/main/java/com/github/nilstrieb/hunterlang/parser/ParseTreeNode.java
+++ b/src/main/java/com/github/nilstrieb/hunterlang/parser/ParseTreeNode.java
@@ -25,8 +25,8 @@ public class ParseTreeNode {
         this(WordType.EMPTY, "");
     }
 
-    public ArrayList<ParseTreeNode> getChildren() {
-        return children;
+    public ParseTreeNode getChild(int index) {
+        return children.get(index);
     }
 
     public void addChild(ParseTreeNode n, boolean pre) {
@@ -96,4 +96,8 @@ public class ParseTreeNode {
     public String getValue() {
         return value;
     }
+
+    public ArrayList<ParseTreeNode> getChildren() {
+        return children;
+    }
 }
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/parser/Parser.java b/src/main/java/com/github/nilstrieb/hunterlang/parser/Parser.java
index 99a58c1..a155e36 100644
--- a/src/main/java/com/github/nilstrieb/hunterlang/parser/Parser.java
+++ b/src/main/java/com/github/nilstrieb/hunterlang/parser/Parser.java
@@ -97,7 +97,9 @@ public class Parser {
                 }
                 case LIBFUNCCALL -> {
                     parent = current.toNode();
-                    parent.addChild(evaluate(tokens.subList(1, tokens.size())));
+                    if(current.hasPostfix()) {
+                        parent.addChild(evaluate(statement.subList(1, statement.size())));
+                    }
                 }
 
                 default -> throw new ParseException("Unexpected value at start of statement: " + current.getKey());
diff --git a/src/main/java/com/github/nilstrieb/hunterlang/run/Main.java b/src/main/java/com/github/nilstrieb/hunterlang/run/Main.java
new file mode 100644
index 0000000..aff249a
--- /dev/null
+++ b/src/main/java/com/github/nilstrieb/hunterlang/run/Main.java
@@ -0,0 +1,85 @@
+package com.github.nilstrieb.hunterlang.run;
+
+import com.github.nilstrieb.hunterlang.interpreter.Interpreter;
+import com.github.nilstrieb.hunterlang.interpreter.RuntimeException;
+import com.github.nilstrieb.hunterlang.lexer.LexToken;
+import com.github.nilstrieb.hunterlang.lexer.Lexer;
+import com.github.nilstrieb.hunterlang.parser.ParseException;
+import com.github.nilstrieb.hunterlang.parser.ParseTreeNode;
+import com.github.nilstrieb.hunterlang.parser.Parser;
+
+import java.util.ArrayList;
+
+public class Main {
+
+    public static void main(String[] args) {
+        Lexer l = new Lexer();
+
+        String assign = """
+                killua70 hunts 3 > 0
+                killua0 hunts 3
+                killua0 hunts -3.4 #hunts nothing
+                killua1 hunts "hallo"
+                #comment""";
+        String ifs = """
+                killua0 hunts 3 > 0
+                Gon wants false {
+                    Leorio does say "false"
+                }
+                wants killua0 > 3 {
+                    Leorio does say "big killua"
+                } got {
+                    Leorio does say "small killua"
+                }
+                Gon wants true {
+                    Gon wants true {
+                        Leorio does say "that is actually very true"
+                    }
+                }
+                """;
+        String ifif = """
+                Gon wants true {
+                    Gon wants true {
+                        Leorio does say "hallo"
+                    }
+                }
+                """;
+        String sif = """
+                Gon wants true {
+                    Leorio does say "hallo"
+                }
+                """;
+        String hierarchy = """
+                killua0 hunts 3 > 3
+                """;
+
+        String weird = """
+                killua1 hunts 2
+                Wing does dump
+                Gon wants 5 < killua1 {
+                    Leorio does say "its actually smaller gon!!!"
+                } wants 1 < killua1 {
+                    Leorio does say "at least that"
+                }
+                """;
+        String hw = """
+                Leorio does say "Hello World!"
+                """;
+
+        ArrayList<LexToken> tokens = l.lex(weird);
+
+        Parser p = new Parser();
+        try {
+            ArrayList<ParseTreeNode> nodes = p.parse(tokens);
+
+            for (ParseTreeNode parseTreeNode : nodes) {
+                System.out.println(parseTreeNode);
+            }
+
+            Interpreter i = new Interpreter();
+            i.start(nodes);
+        } catch (ParseException | RuntimeException e) {
+            e.printStackTrace();
+        }
+    }
+}