diff --git a/src/include/types.h b/src/include/types.h
index aa27909..8f7a36e 100644
--- a/src/include/types.h
+++ b/src/include/types.h
@@ -11,10 +11,10 @@ using namespace std;
 /**
  * Tokens definition
 */
-enum class TokenType { Type, Identifier, Int, Plus, Minus, DoublePlus, DoubleMinus, DoubleEqual, Land, Lor, Lt, Gt, Leq, Geq, NotEqual, Not, Star, Slash, Percent, Equal, Semicolon, LParenthese, RParenthese, LCurlyBracket, RCurlyBracket, If, Else, While, For };
+enum class TokenType { Identifier, Litteral, Plus, Minus, DoublePlus, DoubleMinus, DoubleEqual, Land, Lor, Lt, Gt, Leq, Geq, NotEqual, Not, Star, Slash, Percent, Equal, Semicolon, LParenthese, RParenthese, LCurlyBracket, RCurlyBracket, If, Else, While, For };
 enum class Type { Int };
 
-using TokenData = variant<int, string, Type>;
+using TokenData = variant<int, double, string, Type>;
 
 struct CodePosition {
     int line;
@@ -75,7 +75,7 @@ Unary ->
     | ! Unary
 
 Val ->
-    | Number
+    | Litteral
 
     | ++ParIdentifier
     | --ParIdentifier
diff --git a/src/interpreter.cpp b/src/interpreter.cpp
index 4f98161..aa2e7d5 100644
--- a/src/interpreter.cpp
+++ b/src/interpreter.cpp
@@ -18,6 +18,29 @@ bool bool_cast(EvalResult value) {
     }
 }
 
+int int_cast(EvalResult value) {
+    if (holds_alternative<int>(value)) {
+        return get<int>(value);
+    } else if (holds_alternative<double>(value)) {
+        return int(get<double>(value));
+    }
+    else {
+        throw;
+    }
+}
+
+double double_cast(EvalResult value) {
+    if (holds_alternative<int>(value)) {
+        return double(get<int>(value));
+    }
+    else if (holds_alternative<double>(value)) {
+        return get<double>(value);
+    }
+    else {
+        throw;
+    }
+}
+
 EvalResult eval(Node &ast, Memory &memory) {
     if (holds_alternative<InnerNode>(ast)) {
         InnerNode node = get<InnerNode>(ast);
@@ -30,7 +53,7 @@ EvalResult eval(Node &ast, Memory &memory) {
                 return {};
             break;
             case NodeType::If: {
-                int cond = get<int>(eval(node.children[0], memory));
+                int cond = bool_cast(eval(node.children[0], memory));
                 
                 if (cond) {
                     eval(node.children[1], memory);
@@ -39,7 +62,7 @@ EvalResult eval(Node &ast, Memory &memory) {
                 return {};
             } break;
             case NodeType::IfElse: {
-                int cond = get<int>(eval(node.children[0], memory));
+                int cond = bool_cast(eval(node.children[0], memory));
                 
                 if (cond) {
                     eval(node.children[1], memory);
@@ -52,7 +75,7 @@ EvalResult eval(Node &ast, Memory &memory) {
             } break;
             case NodeType::While: {
                 while (true) {
-                    int cond = get<int>(eval(node.children[0], memory));
+                    int cond = bool_cast(eval(node.children[0], memory));
                     if (!cond) break;
 
                     eval(node.children[1], memory);
@@ -66,7 +89,7 @@ EvalResult eval(Node &ast, Memory &memory) {
                 eval(node.children[0], memory);
 
                 while (true) {
-                    int cond = get<int>(eval(node.children[1], memory));
+                    int cond = bool_cast(eval(node.children[1], memory));
                     if (!cond) break;
 
                     eval(node.children[3], memory);
@@ -137,39 +160,95 @@ EvalResult eval(Node &ast, Memory &memory) {
                 return e1 >= e2;
             } break;
             case NodeType::Plus: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                int e2 = get<int>(eval(node.children[1], memory));
-                return e1 + e2;
+                EvalResult e1 = eval(node.children[0], memory);
+                EvalResult e2 = eval(node.children[1], memory);
+
+                if (holds_alternative<double>(e1) || holds_alternative<double>(e2)) {
+                    double d1 = double_cast(e1);
+                    double d2 = double_cast(e2);
+                    return d1 + d2;
+                }
+                else {
+                    int i1 = get<int>(e1);
+                    int i2 = get<int>(e2);
+                    return i1 + i2;
+                }
             } break;
             case NodeType::Minus: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                int e2 = get<int>(eval(node.children[1], memory));
-                return e1 - e2;
+                EvalResult e1 = eval(node.children[0], memory);
+                EvalResult e2 = eval(node.children[1], memory);
+
+                if (holds_alternative<double>(e1) || holds_alternative<double>(e2)) {
+                    double d1 = double_cast(e1);
+                    double d2 = double_cast(e2);
+                    return d1 - d2;
+                }
+                else {
+                    int i1 = get<int>(e1);
+                    int i2 = get<int>(e2);
+                    return i1 - i2;
+                }
             } break;
             case NodeType::Mult: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                int e2 = get<int>(eval(node.children[1], memory));
-                return e1 * e2;
+                EvalResult e1 = eval(node.children[0], memory);
+                EvalResult e2 = eval(node.children[1], memory);
+
+                if (holds_alternative<double>(e1) || holds_alternative<double>(e2)) {
+                    double d1 = double_cast(e1);
+                    double d2 = double_cast(e2);
+                    return d1 * d2;
+                }
+                else {
+                    int i1 = get<int>(e1);
+                    int i2 = get<int>(e2);
+                    return i1 * i2;
+                }
             } break;
             case NodeType::Div: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                int e2 = get<int>(eval(node.children[1], memory));
-                if (e2 == 0) throw RuntimeError("Division by 0", node.pos);
-                return e1 / e2;
+                EvalResult e1 = eval(node.children[0], memory);
+                EvalResult e2 = eval(node.children[1], memory);
+
+                if (holds_alternative<double>(e1) || holds_alternative<double>(e2)) {
+                    double d1 = double_cast(e1);
+                    double d2 = double_cast(e2);
+                    if (d2 == 0) throw RuntimeError("Division by 0", node.pos);
+                    return d1 / d2;
+                }
+                else {
+                    int i1 = get<int>(e1);
+                    int i2 = get<int>(e2);
+                    if (i2 == 0) throw RuntimeError("Division by 0", node.pos);
+                    return i1 / i2;
+                }
             } break;
             case NodeType::Mod: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                int e2 = get<int>(eval(node.children[1], memory));
-                if (e2 == 0) throw RuntimeError("Modulo by 0", node.pos);
-                return e1 % e2;
+                EvalResult e1 = eval(node.children[0], memory);
+                EvalResult e2 = eval(node.children[1], memory);
+
+                int i1 = get<int>(e1);
+                int i2 = get<int>(e2);
+                if (i2 == 0) throw RuntimeError("Modulo by 0", node.pos);
+                return i1 % i2;
             } break;
             case NodeType::UnaryPlus: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                return +e1;
+                EvalResult e1 = eval(node.children[0], memory);
+                
+                if (holds_alternative<int>(e1)) {
+                    return +get<int>(e1);
+                }
+                else if (holds_alternative<double>(e1)) {
+                    return +get<double>(e1);
+                }
             } break;
             case NodeType::UnaryMinus: {
-                int e1 = get<int>(eval(node.children[0], memory));
-                return -e1;
+                EvalResult e1 = eval(node.children[0], memory);
+                
+                if (holds_alternative<int>(e1)) {
+                    return -get<int>(e1);
+                }
+                else if (holds_alternative<double>(e1)) {
+                    return -get<double>(e1);
+                }
             } break;
             case NodeType::Declaration: {
                 Token typeTok = get<Token>(node.children[0]);
@@ -284,8 +363,15 @@ EvalResult eval(Node &ast, Memory &memory) {
     else {
         Token token = get<Token>(ast);
         switch (token.type) {
-            case TokenType::Int: {
-                return get<int>(token.data);
+            case TokenType::Litteral: {
+                if (holds_alternative<int>(token.data)) {
+                    return get<int>(token.data);
+                } else if (holds_alternative<double>(token.data)) {
+                    return get<double>(token.data);
+                }
+                else {
+                    throw;
+                }
             } break;
             case TokenType::Identifier: {
                 string identifier = get<string>(token.data);
diff --git a/src/parser.cpp b/src/parser.cpp
index 512f4dc..eb42b2c 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -354,7 +354,7 @@ ParseReturn parse_statement(vector<Token> tokens) {
 }
 
 ParseReturn parse_expr_statement(vector<Token> tokens) {
-    if (tokens.size() < 1 || tokens.back().type != TokenType::Type)
+    if (tokens.size() < 1 || tokens.back().type != TokenType::Identifier)
         throw ParseException();
 
     Token type = tokens.back();
@@ -638,7 +638,7 @@ ParseReturn parse_val(vector<Token> tokens) {
         throw ParseException();
 
     switch (tokens.back().type) {
-        case TokenType::Int: { //* Val -> Number
+        case TokenType::Litteral: { //* Val -> Number
             Token number = tokens.back();
             tokens.pop_back();
             return {
diff --git a/src/tokenize.cpp b/src/tokenize.cpp
index b8b5153..9323f8a 100644
--- a/src/tokenize.cpp
+++ b/src/tokenize.cpp
@@ -5,17 +5,43 @@
 #include "include/tokenize.h"
 using namespace std;
 
-regex NUMBER_REGEX ("\\d+(\\.\\d+)?");
-regex TYPE_INT_REGEX ("int(\\s|$)");
+regex INT_REGEX ("\\d+");
+regex DOUBLE_REGEX ("\\d+\\.\\d*|\\d*\\.\\d+");
 regex IDENTIFIER_REGEX ("[A-Za-z_]\\w*");
 
+vector<tuple<string, TokenType>> simpleTokens = {
+    { "if", TokenType::If },
+    { "else", TokenType::Else },
+    { "while", TokenType::While },
+    { "for", TokenType::For },
+    { "++", TokenType::DoublePlus },
+    { "--", TokenType::DoubleMinus },
+    { "==", TokenType::DoubleEqual },
+    { "&&", TokenType::Land },
+    { "||", TokenType::Lor },
+    { "<=", TokenType::Leq },
+    { ">=", TokenType::Geq },
+    { "!=", TokenType::NotEqual },
+    { "<", TokenType::Lt },
+    { ">", TokenType::Gt },
+    { "!", TokenType::Not },
+    { "+", TokenType::Plus },
+    { "-", TokenType::Minus },
+    { "*", TokenType::Star },
+    { "/", TokenType::Slash },
+    { "%", TokenType::Percent },
+    { "=", TokenType::Equal },
+    { ";", TokenType::Semicolon },
+    { "(", TokenType::LParenthese },
+    { ")", TokenType::RParenthese },
+    { "{", TokenType::LCurlyBracket },
+    { "}", TokenType::RCurlyBracket }
+};
+
 void _debug_print_token(Token token) {
     switch (token.type) {
-        case TokenType::Type:
-            cout << "Type(INT)";
-        break;
-        case TokenType::Int:
-            cout << "Number(" << get<int>(token.data) << ")";
+        case TokenType::Litteral:
+            cout << "Litteral(" << "tmp" << ")";
         break;
         case TokenType::Identifier:
             cout << "Identifier(" << get<string>(token.data) << ")";
@@ -103,9 +129,8 @@ void _debug_print_token(Token token) {
 
 string _debug_print_token_type(TokenType type) {
     switch (type) {
-        case TokenType::Type: return "Type";
         case TokenType::Identifier: return "Identifier";
-        case TokenType::Int: return "Int";
+        case TokenType::Litteral: return "Litteral";
         case TokenType::Plus: return "Plus";
         case TokenType::Minus: return "Minus";
         case TokenType::DoublePlus: return "DoublePlus";
@@ -156,155 +181,41 @@ vector<Token> tokenize(vector<string> input, int initial_line) {
             string str = line.substr(j, string::npos);
             smatch m;
 
-            if (regex_search(str, m, NUMBER_REGEX, regex_constants::match_continuous)) {
+            if (regex_search(str, m, DOUBLE_REGEX, regex_constants::match_continuous)) {
                 Token token = {
-                    .type = TokenType::Int,
+                    .type = TokenType::Litteral,
+                    .data = stod(m.str()),
+                    .pos = pos
+                };
+                tokens.emplace_back(token);
+                j += m.str().length();
+                continue;
+            }
+
+            if (regex_search(str, m, INT_REGEX, regex_constants::match_continuous)) {
+                Token token = {
+                    .type = TokenType::Litteral,
                     .data = stoi(m.str()),
                     .pos = pos
                 };
                 tokens.emplace_back(token);
                 j += m.str().length();
+                continue;
             }
-            else if (regex_search(str, m, TYPE_INT_REGEX, regex_constants::match_continuous)) {
-                Token token = {
-                    .type = TokenType::Type,
-                    .data = Type::Int,
-                    .pos = pos
-                };
-                tokens.emplace_back(token);
-                j += m.str().length();
+            
+            bool matched = false;
+            for (auto simpleToken: simpleTokens) {
+                if (str.starts_with(get<0>(simpleToken))) {
+                    Token token = { .type = get<1>(simpleToken), .pos = pos };
+                    tokens.emplace_back(token);
+                    j += get<0>(simpleToken).length();
+                    matched = true;
+                    break;
+                }
             }
-            else if (str.starts_with("if")) {
-                Token token = { .type = TokenType::If, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("else")) {
-                Token token = { .type = TokenType::Else, .pos = pos };
-                tokens.emplace_back(token);
-                j += 4;
-            }
-            else if (str.starts_with("while")) {
-                Token token = { .type = TokenType::While, .pos = pos };
-                tokens.emplace_back(token);
-                j += 5;
-            }
-            else if (str.starts_with("for")) {
-                Token token = { .type = TokenType::For, .pos = pos };
-                tokens.emplace_back(token);
-                j += 3;
-            }
-            else if (str.starts_with("++")) {
-                Token token = { .type = TokenType::DoublePlus, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("--")) {
-                Token token = { .type = TokenType::DoubleMinus, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("==")) {
-                Token token = { .type = TokenType::DoubleEqual, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("&&")) {
-                Token token = { .type = TokenType::Land, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("||")) {
-                Token token = { .type = TokenType::Lor, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("<=")) {
-                Token token = { .type = TokenType::Leq, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with(">=")) {
-                Token token = { .type = TokenType::Geq, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("!=")) {
-                Token token = { .type = TokenType::NotEqual, .pos = pos };
-                tokens.emplace_back(token);
-                j += 2;
-            }
-            else if (str.starts_with("<")) {
-                Token token = { .type = TokenType::Lt, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with(">")) {
-                Token token = { .type = TokenType::Gt, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("!")) {
-                Token token = { .type = TokenType::Not, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("+")) {
-                Token token = { .type = TokenType::Plus, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("-")) {
-                Token token = { .type = TokenType::Minus, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("*")) {
-                Token token = { .type = TokenType::Star, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("/")) {
-                Token token = { .type = TokenType::Slash, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("%")) {
-                Token token = { .type = TokenType::Percent, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("=")) {
-                Token token = { .type = TokenType::Equal, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with(";")) {
-                Token token = { .type = TokenType::Semicolon, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("(")) {
-                Token token = { .type = TokenType::LParenthese, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with(")")) {
-                Token token = { .type = TokenType::RParenthese, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("{")) {
-                Token token = { .type = TokenType::LCurlyBracket, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (str.starts_with("}")) {
-                Token token = { .type = TokenType::RCurlyBracket, .pos = pos };
-                tokens.emplace_back(token);
-                j += 1;
-            }
-            else if (regex_search(str, m, IDENTIFIER_REGEX, regex_constants::match_continuous)) {
+            if (matched) continue;
+            
+            if (regex_search(str, m, IDENTIFIER_REGEX, regex_constants::match_continuous)) {
                 Token token = {
                     .type = TokenType::Identifier,
                     .data = m.str(),
@@ -312,13 +223,15 @@ vector<Token> tokenize(vector<string> input, int initial_line) {
                 };
                 tokens.emplace_back(token);
                 j += m.str().length();
+                continue;
             }
-            else if (isspace(str[0])) {
+            
+            if (isspace(str[0])) {
                 j += 1;
+                continue;
             }
-            else {
-                throw TokenError("Unknown token", pos);
-            }
+
+            throw TokenError("Unknown token", pos);
         }
     }
 
diff --git a/test/tokenize.cpp b/test/tokenize.cpp
index 8eb2e4a..d9ed297 100644
--- a/test/tokenize.cpp
+++ b/test/tokenize.cpp
@@ -15,7 +15,7 @@ int main() {
     };
 
     vector<TokenType> expectedTypes = {
-        TokenType::Type, TokenType::Identifier, TokenType::Equal, TokenType::Identifier,
+        TokenType::Identifier, TokenType::Identifier, TokenType::Equal, TokenType::Identifier,
         TokenType::DoublePlus, TokenType::DoubleMinus, TokenType::DoubleEqual, TokenType::Land,
         TokenType::Lor, TokenType::Lt, TokenType::Gt, TokenType::Leq, TokenType::Geq, TokenType::NotEqual,
         TokenType::Not, TokenType::Star, TokenType::Slash, TokenType::Percent, TokenType::Equal,
@@ -42,12 +42,12 @@ int main() {
         )
 
         _TEST_ASSERT(
-            _TEST_NO_EXCEPTION(tokens[0].type == TokenType::Type),
-            "Le premier token devrait être de type 'Type'",
+            _TEST_NO_EXCEPTION(tokens[0].type == TokenType::Identifier),
+            "Le premier token devrait être de type 'Identifier'",
             false
         )
         _TEST_ASSERT(
-            _TEST_NO_EXCEPTION(get<Type>(tokens[0].data) == Type::Int),
+            _TEST_NO_EXCEPTION(get<string>(tokens[0].data) == "int"),
             "Les données du premier token devraient être 'Int'",
             false
         )
@@ -93,8 +93,8 @@ int main() {
         )
 
         _TEST_ASSERT(
-            _TEST_NO_EXCEPTION(tokens[6].type == TokenType::Int),
-            "Le premier token devrait être de type 'Int'",
+            _TEST_NO_EXCEPTION(tokens[6].type == TokenType::Litteral),
+            "Le premier token devrait être de type 'Litteral'",
             false
         )
         _TEST_ASSERT(