diff --git a/src/main/java/TP2/llvm/Interface.java b/src/main/java/TP2/llvm/Interface.java
index b04ce61..8098f94 100644
--- a/src/main/java/TP2/llvm/Interface.java
+++ b/src/main/java/TP2/llvm/Interface.java
@@ -1,9 +1,4 @@
 package TP2.llvm;
-import TP2.asd.Program.AssignImp;
-import TP2.asd.Program.BinopExpressionImp;
-import TP2.asd.Program.ConstImp;
-import TP2.asd.Program.ProgramImp;
-import TP2.asd.Program.Return_instrImp;
 import TP2.llvm.ProgramLLVM.*;
 
 public interface Interface {
@@ -14,51 +9,59 @@ public interface Interface {
     }
 
     public interface ProgramLLVMVisitor<H,S> {
-        public S visitProgramLLVM(ProgramLLVMImpl e, H h);
+        public S visitProgramLLVM(ProgramLLVMImpl prog, H h);
     }
 
     //////////DefineLLVM (function)
     public interface DefineLLVM{
         public <H,S> S accept(DefineLLVMVisitor<H,S> v, H h);
-        public String prettyprinter(); 
     }
 
     public interface DefineLLVMVisitor<H,S> {
-        public S visitProgramLLVM(DefineLLVMImpl e, H h);
+        public S visitDefineLLVM(DefineLLVMImpl define, H h);
     }
 
     public interface InstructionLLVM{
         public <H,S> S accept(InstructionLLVMVisitor<H,S> v, H h);
-        public String prettyprinter(); 
     }
 
     public interface InstructionLLVMVisitor<H,S> {
-        public S visitReturnLLVM(ReturnLLVMImp e, H h);
-        public S visitAssignLLVM(AssignLVMImp e, H h);
+        public S visitReturnLLVM(ReturnLLVMImp instr, H h);
+        public S visitAssignLLVM(AssignLVMImp instr, H h);
     }
 
     //////////ExpressionLLVM (expression)
     public interface ExpressionLLVM{
-        public String prettyprinter(); 
+        public <H,S> S accept(ExpressionLLVMVisitor<H,S> v, H h);
         public TypeLLVM getType();
     }
 
-    public interface ExpressionLLVMVisitor<H,S> {
-        public S visitConstLLVM(ValLLVM e,H h);
-        public S visitBinOpLLVM(BinOpLLVMImp e, H h);
-    }
-
     public interface ValLLVM extends ExpressionLLVM{
-        public String prettyprinter(); 
     }  
 
-    public interface IdentifierLLVM{ //globaux @ et local %
+    public interface ExpressionLLVMVisitor<H,S> {
+        public S visitBinOpLLVM(BinOpLLVMImp e, H h);
+        public S visitAllocaLLVM(allocaLLVMImpl e,H h);
+        public S visitLoadLLVM(loadLLVMImpl e,H h);
+        public S visitValLLVM(ValLLVMImpl e,H h);
+        public S visitVarLLVM(VarLLVMImpl e,H h);
+    }
+
+    /*public interface IdentifierLLVM{ //globaux @ et local %
         public String prettyprinter(); 
     }
 
+    public interface IndentifierLLVMVisitor<H,S> {
+    }*/
+
     public interface TypeLLVM{
-        public String prettyprinter(); 
+        public <H,S> S accept(TypeLLVMVisitor<H,S> v, H h);
         public int getNbBit();
     }
 
+    public interface TypeLLVMVisitor<H,S> {
+        public S visitIntLLVM(IntLLVMImpl e,H h);
+        public S visitVoidLLVM(VoidLLVMImpl e, H h);
+    }
+
 }
diff --git a/src/main/java/TP2/llvm/PrettyprinterLLVM_Visitor.java b/src/main/java/TP2/llvm/PrettyprinterLLVM_Visitor.java
new file mode 100644
index 0000000..3b6d6e7
--- /dev/null
+++ b/src/main/java/TP2/llvm/PrettyprinterLLVM_Visitor.java
@@ -0,0 +1,118 @@
+package TP2.llvm;
+
+import TP2.llvm.Interface.*;
+import TP2.llvm.ProgramLLVM.*;
+
+public class PrettyprinterLLVM_Visitor implements ProgramLLVMVisitor<String,String>,
+DefineLLVMVisitor<String,String>,
+InstructionLLVMVisitor<String,String>,
+ExpressionLLVMVisitor<String,String>,
+TypeLLVMVisitor<String,String>
+{
+    static String INDENT = "   ";
+
+    @Override
+    public String visitProgramLLVM(ProgramLLVMImpl prog, String indent) {
+        StringBuilder str = new StringBuilder();
+            str.append("; Target\n");
+            str.append("target triple = \"x86_64-pc-linux-gnu\"\n");
+            str.append("; ; External declaration of the printf function\n");
+            str.append("declare i32 @printf (i8 * noalias nocapture, ...)\n");
+            str.append("declare i32 @scanf (i8 * noalias nocapture, ...)\n");
+            str.append("\n");
+            str.append("; Actual code begins\n");
+
+            // Déclaration pour les string
+            //for(int i = 0; i<declration.size(); i++){
+                //str.append(declration.get(i) + "\n");
+            //}
+
+            //PROTO et FUNC
+            for(DefineLLVM fonction : prog.fonctions()){
+                str.append(fonction.accept(this,indent));
+                str.append("\n");
+            }
+            return str.toString();
+    }
+
+    @Override
+    public String visitDefineLLVM(DefineLLVMImpl define, String indent) {
+        StringBuilder str = new StringBuilder("define ");
+            str.append(define.type().accept(this,indent)).append(" @").append(define.nom()).append("(");
+
+            //TODO param
+
+            str.append("){\n");
+            for(InstructionLLVM instr : define.instrs()){
+                str.append(instr.accept(this,indent)).append("\n");
+            }
+            str.append("}");
+            return str.toString();
+    }
+
+    @Override
+    public String visitReturnLLVM(ReturnLLVMImp instr, String h) {
+        return INDENT+"ret " + instr.type().accept(this, h) + " " + instr.e().accept(this, h);
+    }
+
+    @Override
+    public String visitAssignLLVM(AssignLVMImp instr, String h) {
+        return INDENT+instr.var().accept(this, h) + " = " + instr.e().accept(this, h);
+    }
+
+    @Override
+    public String visitBinOpLLVM(BinOpLLVMImp e, String h) {
+        String str = "";
+            switch(e.op()){
+                case PLUS:
+                    str += "add ";
+                    break;
+                case MINUS:
+                    str += "sub ";
+                    break;
+                case TIMES:
+                    str += "mul ";
+                    break;
+                case DIV:
+                    str += "sdiv "; //division signé
+                    break;
+                case MOD:
+                    str += "srem "; //modulo signé
+                    break;
+                default:
+                    throw new AssertionError("Binop : opération inconne");
+            }
+            return str + e.type().accept(this,h) + " " + e.val1().accept(this,h) + ", " + e.val2().accept(this,h);
+    }
+
+    @Override
+    public String visitAllocaLLVM(allocaLLVMImpl e, String h) {
+        return "aloca" + " i" + e.type().getNbBit();
+    }
+
+    @Override
+    public String visitLoadLLVM(loadLLVMImpl e, String h) {
+        return "load" + " i" + e.nbBits() + ", i"+ e.nbBits2() + "* %" + e.val().accept(this, h);
+    }
+
+    @Override
+    public String visitValLLVM(ValLLVMImpl e, String h) {
+        return e.val() + "";
+    }
+
+    @Override
+    public String visitVarLLVM(VarLLVMImpl e, String h) {
+        return "%"+e.nom();
+    }
+
+    @Override
+    public String visitIntLLVM(IntLLVMImpl e, String h) {
+        return "i32";
+    }
+
+    @Override
+    public String visitVoidLLVM(VoidLLVMImpl e, String h) {
+        return "void";
+    }
+
+}
diff --git a/src/main/java/TP2/llvm/ProgramLLVM.java b/src/main/java/TP2/llvm/ProgramLLVM.java
index 8c11387..c8e01d8 100644
--- a/src/main/java/TP2/llvm/ProgramLLVM.java
+++ b/src/main/java/TP2/llvm/ProgramLLVM.java
@@ -3,7 +3,6 @@ package TP2.llvm;
 import java.util.ArrayList;
 
 import TP2.asd.Interface.*;
-import TP2.asd.Program.*;
 import TP2.llvm.Interface.*;
 
 
@@ -19,61 +18,16 @@ public class ProgramLLVM {
         }
         
         public String prettyprinter(){
-            StringBuilder str = new StringBuilder();
-            str.append("; Target\n");
-            str.append("target triple = \"x86_64-pc-linux-gnu\"\n");
-            str.append("; ; External declaration of the printf function\n");
-            str.append("declare i32 @printf (i8 * noalias nocapture, ...)\n");
-            str.append("declare i32 @scanf (i8 * noalias nocapture, ...)\n");
-            str.append("\n");
-            str.append("; Actual code begins\n");
-
-            // Déclaration pour les string
-            //for(int i = 0; i<declration.size(); i++){
-                //str.append(declration.get(i) + "\n");
-            //}
-
-            //PROTO et FUNC
-            for(DefineLLVM fonction : fonctions){
-                str.append(fonction.prettyprinter());
-                str.append("\n");
-            }
-            return str.toString();
+            PrettyprinterLLVM_Visitor ppVisitor = new PrettyprinterLLVM_Visitor();
+            return this.accept(ppVisitor, "");
         }
-
-
     }
 
     
     //Define
     public static record DefineLLVMImpl(String nom, TypeLLVM type, ArrayList<InstructionLLVM> instrs) implements DefineLLVM{
         public <H, S> S accept(DefineLLVMVisitor<H, S> v, H h) {
-            return v.visitProgramLLVM(this, h);
-        }
-
-        /*public String type_toString(){
-            switch(t.prettyprinter()){
-                case "INT":
-                    return "i32";
-                case "VOID":
-                    return "void";
-                default:
-                    throw new AssertionError();
-            }
-        }*/
-
-        public String prettyprinter(){
-            StringBuilder str = new StringBuilder("define ");
-            str.append(type.prettyprinter()).append(" @").append(nom).append("(");
-
-            //TODO param
-
-            str.append("){\n");
-            for(InstructionLLVM instr : instrs){
-                str.append(instr.prettyprinter()).append("\n");
-            }
-            str.append("}");
-            return str.toString();
+            return v.visitDefineLLVM(this, h);
         }
     }
 
@@ -93,9 +47,6 @@ public class ProgramLLVM {
         public <H, S> S accept(InstructionLLVMVisitor<H, S> v, H h) {
             return v.visitAssignLLVM(this, h);
         }
-        public String prettyprinter(){
-            return INDENT+var.prettyprinter() + " = " + e.prettyprinter();
-        }
     }
 
     public static record ReturnLLVMImp(TypeLLVM type, ExpressionLLVM e) implements InstructionLLVM{
@@ -103,46 +54,14 @@ public class ProgramLLVM {
         public <H, S> S accept(InstructionLLVMVisitor<H, S> v, H h) {
             return v.visitReturnLLVM(this, h);
         }
-
-        public String prettyprinter(){
-            return INDENT+"ret " + type.prettyprinter() + " " + e.prettyprinter();
-        }
-
-
     }
 
     //Expression :
     public static record BinOpLLVMImp(TypeLLVM type,Op op, ValLLVM val1,ValLLVM val2) implements ExpressionLLVM{
+        @Override
         public <H, S> S accept(ExpressionLLVMVisitor<H, S> v, H h) {
             return v.visitBinOpLLVM(this, h);
         }
-        public String op_toString(){
-            StringBuilder str = new StringBuilder();
-            switch(op){
-                case PLUS:
-                    str.append("add ");
-                    break;
-                case MINUS:
-                    str.append("sub ");
-                    break;
-                case TIMES:
-                    str.append("mul ");
-                    break;
-                case DIV:
-                    str.append("sdiv "); //division signé
-                    break;
-                case MOD:
-                    str.append("srem "); //modulo signé
-                    break;
-                default:
-                    throw new AssertionError();
-            }
-            return str.toString(); //TODO
-        }
-
-        public String prettyprinter(){
-            return op_toString() + type.prettyprinter() + " " + val1.prettyprinter() + ", " + val2.prettyprinter();
-        }
 
         @Override
         public TypeLLVM getType() {
@@ -165,9 +84,11 @@ public class ProgramLLVM {
 
 
     public static record allocaLLVMImpl(TypeLLVM type) implements ExpressionLLVM{
-        public String prettyprinter(){
-            return "aloca" + " i" + type.getNbBit();
+        @Override
+        public <H, S> S accept(ExpressionLLVMVisitor<H, S> v, H h) {
+            return v.visitAllocaLLVM(this, h);
         }
+
         @Override
         public TypeLLVM getType() {
             return type;
@@ -176,9 +97,11 @@ public class ProgramLLVM {
 
 
     public static record loadLLVMImpl(TypeLLVM type, int nbBits,int nbBits2, ValLLVM val) implements ExpressionLLVM{
-        public String prettyprinter(){
-            return "load" + " i" + nbBits + ", i"+ nbBits2 + "* %" + val.prettyprinter();
+        @Override
+        public <H, S> S accept(ExpressionLLVMVisitor<H, S> v, H h) {
+            return v.visitLoadLLVM(this, h);
         }
+
         @Override
         public TypeLLVM getType() {
             return type;
@@ -189,8 +112,9 @@ public class ProgramLLVM {
     //Val
 
     public static record ValLLVMImpl(TypeLLVM type, int val) implements ValLLVM{
-        public String prettyprinter(){
-            return val + "";
+        @Override
+        public <H, S> S accept(ExpressionLLVMVisitor<H, S> v, H h) {
+            return v.visitValLLVM(this, h);
         }
 
         @Override
@@ -201,8 +125,9 @@ public class ProgramLLVM {
 
 
     public static record VarLLVMImpl(TypeLLVM type, String nom) implements ValLLVM{
-        public String prettyprinter(){
-            return "%"+nom;
+        @Override
+        public <H, S> S accept(ExpressionLLVMVisitor<H, S> v, H h) {
+            return v.visitVarLLVM(this, h);
         }
 
         @Override
@@ -215,27 +140,25 @@ public class ProgramLLVM {
     public static record IntLLVMImpl() implements TypeLLVM{
 
         @Override
-        public String prettyprinter() {
-            return "i32";
+        public <H, S> S accept(TypeLLVMVisitor<H, S> v, H h) {
+            return v.visitIntLLVM(this, h);
         }
 
         public int getNbBit(){
             return 32;
         }
-
     }
 
 
     public static record VoidLLVMImpl() implements TypeLLVM{
 
         @Override
-        public String prettyprinter() {
-            return "void";
+        public <H, S> S accept(TypeLLVMVisitor<H, S> v, H h) {
+            return v.visitVoidLLVM(this, h);
         }
 
         public int getNbBit(){
             return 0;
         }
-
     }
 }