diff --git a/Makefile b/Makefile
index 835ca44..82b7364 100644
--- a/Makefile
+++ b/Makefile
@@ -96,8 +96,12 @@ $(NAME): $(OBJS)
 	$(CC) $(OBJS) -o $@ $(LFLAGS)
 
 run: $(NAME)
-	@echo $(YELLOW)"run"$(RESET)
-	@./$(NAME) "3.4 * x^2 + 1 * x^1 - 2.0 * x^0 = 5.123 * x^1"
+	@echo $(BLUE)"\n -> run \n"$(RESET)
+	./$(NAME) -d "3.4 * x^2 + 1 * x^1 - 2.0 * x^0 = 5.123 * x^1"
+	@echo $(BLUE)"\n -> run \n"$(RESET)
+	./$(NAME) -d "3 * x^2 + 5 * x^1 - 2 * x^0 = 5 * x^1"
+	@echo $(BLUE)"\n -> run \n"$(RESET)
+	./$(NAME) -d "3*x^2 + 2*x = 0"
 
 clean:
 	$(RM_OBJS)
diff --git a/README.md b/README.md
index 4cc5cfc..1bcb8ef 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,12 @@ this project uses submodules (maybe recursively), so either :
          EXPONENT -> double
        }[]
 3. reduce
+    -> polynom :
+       {
+         a -> double
+         b -> double
+         c -> double
+       }[]
 4. print reduced form
 5. find degree
 6. print degree
diff --git a/headers/computorv1.h b/headers/computorv1.h
index 7583197..19b6a98 100644
--- a/headers/computorv1.h
+++ b/headers/computorv1.h
@@ -8,6 +8,16 @@
 #include <stdarg.h> // for va_list
 #include <stdbool.h>
 
+/** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * COMPUTORV1.C
+ */
+
+typedef enum
+{
+    MODE_ARGV,  //
+    MODE_STDIN, //
+} e_program_mode;
+
 /** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * LEXER.C
  */
@@ -96,6 +106,7 @@ void reduce(s_term *terms, s_polynom *polynom);
 typedef enum
 {
     ERROR_BASE = 1, // start at 1 to avoid exit(0) for errors
+    ARGUMENTS_ERROR,
     ERROR_TOKEN_COUNT,
     ERROR_UNKNOWN_TOKEN,
     ERROR_NUMBER_TOO_BIG,
@@ -126,5 +137,6 @@ extern char *input_g_err;
 extern s_token *tokens_g_err;
 extern s_term *terms_g_err;
 extern s_polynom *polynom_g_err;
+extern bool debug_mode;
 
 #endif
\ No newline at end of file
diff --git a/src/computorv1.c b/src/computorv1.c
index 239fb42..b50b7ea 100644
--- a/src/computorv1.c
+++ b/src/computorv1.c
@@ -10,6 +10,7 @@ char *input_g_err;
 s_token *tokens_g_err;
 s_term *terms_g_err;
 s_polynom *polynom_g_err;
+bool debug_mode;
 
 /**
  * PROGRAM
@@ -80,20 +81,13 @@ static void terms_fill_null(s_term *terms, size_t terms_count_prediction)
     }
 }
 
-int main(int ac, char **av)
+static void launch_argv(char *input)
 {
     int ret;
     size_t arg_len;
     size_t terms_count_prediction;
-    char *input;
-
-    if (ac < 2)
-    {
-        return 0;
-    }
 
     // init
-    input = av[1];
     input_g_err = input;
     remove_spaces(input);
 
@@ -128,6 +122,132 @@ int main(int ac, char **av)
 
     // debug
     print_state();
+}
+
+static void clean_copy_input(char *input, char *line)
+{
+    size_t i;
+    size_t j;
+    size_t len;
+    size_t len_trim_end;
+    size_t len_trim_start;
+
+    len = ft_strlen(line);
+
+    // get len minus : ' | " | \n | <space>
+    i = len;
+    while (i > 0)
+    {
+        if (ft_strchr("\"\'\n", line[i]))
+            i--;
+        if (ft_isspace(line[i]))
+            i--;
+        break;
+    }
+    len_trim_end = i;
+
+    // get len of leading chars : ' | " | <space> | \n
+    i = 0;
+    while (i < len_trim_end)
+    {
+        if (ft_strchr("\"\'\n", line[i]))
+            i++;
+        if (ft_isspace(line[i]))
+            i++;
+        break;
+    }
+    len_trim_start = i;
+
+    // copy into input
+    i = len_trim_start;
+    j = 0;
+    while (i <= len_trim_end)
+    {
+        input[j] = line[i];
+        j++;
+        i++;
+    }
+    input[j] = '\0';
+}
+
+static void launch_stdin()
+{
+    char *line;
+    size_t len;
+
+    line = NULL;
+    len = 0;
+
+    // get input
+    getline(&line, &len, stdin);
+
+    // prepare input
+    char input[len];
+    clean_copy_input(input, line);
+
+    // launch input
+    launch_argv(input);
+
+    // FREE LINE !
+    free(line);
+}
+
+int main(int ac, char **av)
+{
+    char *input;
+    e_program_mode program_mode;
+
+    debug_mode = false;
+
+    // check arguments
+    program_mode = MODE_ARGV;
+    if (ac > 3)
+    {
+        stop_errors(ARGUMENTS_ERROR, "too many arguments");
+    }
+    else if (ac == 3)
+    {
+        if ((ft_strcmp(av[1], "-d") == 0))
+        {
+            debug_mode = true;
+            input = av[2];
+        }
+        else if ((ft_strcmp(av[2], "-d") == 0))
+        {
+            debug_mode = true;
+            input = av[1];
+        }
+        else
+        {
+            stop_errors(ARGUMENTS_ERROR, "3rd argument is not a valid flag: '%s'", av[2]);
+        }
+    }
+    else if (ac == 2)
+    {
+        if ((ft_strcmp(av[1], "-d") == 0))
+        {
+            debug_mode = true;
+            program_mode = MODE_STDIN;
+        }
+        else
+        {
+            input = av[1];
+        }
+    }
+    else if (ac < 2)
+    {
+        program_mode = MODE_STDIN;
+    }
+
+    // launch calculator
+    if (program_mode == MODE_ARGV)
+    {
+        launch_argv(input);
+    }
+    else if (program_mode == MODE_STDIN)
+    {
+        launch_stdin();
+    }
 
     return (0);
 }
diff --git a/src/utils/errors.c b/src/utils/errors.c
index 8310c06..da96e44 100644
--- a/src/utils/errors.c
+++ b/src/utils/errors.c
@@ -104,6 +104,8 @@ static void print_context_polynom()
 
 void print_state()
 {
+    if (!debug_mode)
+        return;
     ft_dprintf(STDERR_FILENO, "\nSTATE :\n");
     if (input_g_err)
         print_context_input();
@@ -123,6 +125,7 @@ int stop_errors(e_program_error err, const char *details, ...)
     // map error codes to messages
     const char *error_messages[ERROR_SENTINEL] = {
         [ERROR_BASE] = "undefined error",
+        [ARGUMENTS_ERROR] = "arguments error",
         [ERROR_UNKNOWN_TOKEN] = "LEXER - unknown token",
         [ERROR_NUMBER_TOO_BIG] = "LEXER - number is too big",
         [ERROR_PARSING] = "PARSER - too much terms to parse",