diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1b1b18d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,19 @@
+LEX = flex
+YACC = bison -d
+CC = gcc
+
+compilateur: as.tab.c lex.yy.c
+	$(CC) -o compilateur as.tab.c lex.yy.c
+
+as.tab.c: as.y
+	$(YACC) as.y
+
+
+lex.yy.c: al.lex
+	$(LEX) al.lex
+
+
+build: compilateur
+
+clean:
+	rm as.tab.c as.tab.h lex.yy.c compilateur
diff --git a/al.lex b/al.lex
new file mode 100644
index 0000000..15059e5
--- /dev/null
+++ b/al.lex
@@ -0,0 +1,54 @@
+%{
+#include "as.tab.h"
+%}
+
+D           [0-9]
+
+%%
+
+{D}+(e{D}+)?	{ 
+                yylval.nombre = atoi(yytext);
+                return tNB;
+            }
+
+"+"			{ return tADD; }
+"-"			{ return tSUB; }
+"*"			{ return tMUL; }
+"/"			{ return tDIV; }
+"="			{ return tEQ; }
+"("			{ return tPO; }
+")"			{ return tPF; }
+";"			{ return tPV; }
+","			{ return tVIRG; }
+"{"			{ return tAO; }
+"}"			{ return tAF; }
+"!"		{ return tNOT; }
+"=="		{ return tEQ2; }
+"!="		{ return tNOTEQ; }
+"<"			{ return tINF; }
+"<="		{ return tINFEQ; }
+">"			{ return tSUP; }
+">="		{ return tSUPEQ; }
+"&&"		{ return tAND; }
+"||"		{ return tOR; }
+[ \t\n]+	{ }
+
+"int"		{ return tINT; }
+"const"		{ return tCONST; }
+"main"		{ return tMAIN; }
+"if"		{ return tIF; }
+"else"		{ return tELSE; }
+"elsif"		{ return tELSIF; }
+"while"		{ return tWHILE; }
+"printf"	{ return tPRINTF; }
+[a-zA-Z][a-zA-Z0-9_]*		{ return tID; }
+
+%%
+
+int yywrap() {
+	return 1;
+}
+// int main () {
+// 	yylex();
+// 	return 1;
+// } 
diff --git a/as.y b/as.y
new file mode 100644
index 0000000..6da3010
--- /dev/null
+++ b/as.y
@@ -0,0 +1,115 @@
+%{
+#include "stdio.h"
+#include "stdlib.h"
+%}
+
+%union {
+	int nombre;
+}
+
+%token<nombre> tNB
+%token tADD
+%token tSUB
+%token tMUL
+%token tDIV
+%token tPO
+%token tPF
+%token tPV
+%token tVIRG
+%token tAO
+%token tAF
+%token tEQ
+%token tEQ2
+%token tNOTEQ
+%token tNOT
+%token tINF
+%token tINFEQ
+%token tSUP
+%token tSUPEQ
+%token tAND
+%token tOR
+
+%token tINT
+%token tCONST
+%token tMAIN
+%token tIF
+%token tELSE
+%token tELSIF
+%token tWHILE
+%token tPRINTF
+%token tID
+
+%left tADD
+%left tSUB
+%left tMUL
+%left tDIV
+// %type<nombre> E
+
+%%
+
+S : Main ;
+
+Main : tINT tMAIN tPO Params tPF Body ;
+
+Params : | Param SuiteParams ;
+Param : tINT tID ;
+
+SuiteParams : tVIRG Param SuiteParams ;
+
+Body : tAO Instructions tAF ;
+
+Instructions : Instruction Instructions | ;
+
+Instruction : Aff | Printf  | If ;
+
+Aff : tID tEQ E tPV ;
+
+E : tNB | tID | E tADD E | E tMUL E | E tSUB E | E tDIV E | tPO E tPF | tSUB E ;
+
+
+If : IfSimple | IfElse ;
+
+IfSimple : tIF tPO Cond tPF Body ;
+
+IfElse : IfSimple tELSE Body  ;
+
+Cond : Cond tAND Cond | Cond tOR Cond | E tEQ2 E | E tINF E | E tINFEQ E | E tSUP E | E tSUPEQ E | E tNOTEQ E | tNOT Cond | tNOT tPO Cond tPF ;
+
+Printf : tPRINTF tPO tID tPF tPV
+
+// If : tIF tPO Cond tPF Body ;
+// 
+// Cond : Cond tAND Cond | Cond tOR Cond | E tEQ2 E | E tINF E | tNOT Cond ;
+
+// Invocation : tID tPO  Args  tPF ;
+
+// Args : .... cf params
+
+// Return : tRET E tPV ;
+
+
+/* S -> E ; S
+ * S ->
+ */
+// S : E tPV
+// 						{ printf("RES: %d\n", $1); }
+// 		S
+// 	|					{ printf("END\n"); }
+// 	;
+// 
+// E : E tADD E	{ $$ = $1 + $3; }
+// 	| E tSUB E	{ $$ = $1 - $3; }
+// 	| tOB E tCB	{ $$ = $2; }
+// 	| tNB				{ $$ = $1; }
+// 	;
+
+%%
+
+void yyerror(char const* err) {
+    printf("%s\n", err);
+    exit(1);
+}
+
+void main(void) {
+	yyparse();
+}
diff --git a/test.c b/test.c
new file mode 100644
index 0000000..3550380
--- /dev/null
+++ b/test.c
@@ -0,0 +1,7 @@
+int main(){
+    x = 3 + 6;
+    printf(x);
+    if (x == x && y != 5 + 6 || 1 + 2 == 2 + 1 && !(x == x)) {
+        printf(x);
+    }
+}