add Makefile's comment

Makefile

@@ -1,34 +1,50 @@
-# VARIABLES
-CXX 	= g++
-SRC_DIR = src
-OBJ_DIR = .obj
-INC_DIR = inc
-WFLAGS 	= -Wall
-OFLAG 	= -o
-TARGET  = main
-EXEC 	= ./$(TARGET)
-INCLUDE = -I $(INC_DIR)
+# [--------------------DIRECTORIES--------------------] 
+# SRC_DIR is the source directory
+# OBJ_DIR is the object directory 
+# INC_DIR is the header directory
+SRC_DIR 	:= src
+OBJ_DIR 	:= obj
+INC_DIR 	:= inc
+
+# [--------------------COMPILE & RUN--------------------] 
+# CXX is the keyword to compile .cpp src files
+# WFLAG is a flag to detect all the warnings
+# OFLAG is the flag to rename the output of the compiler
+# TARGET is the name of the output
+# INCLUDE add to g++ path the custom include path 
+CXX 		:= g++
+WFLAGS 		:= -Wall
+OFLAG 		:= -o
+TARGET  	:= main
+INCLUDE 	:= -I $(INC_DIR)
 
 
-# FUNCTION:
-SRCS 	:= $(shell find $(SRC_DIR) -name "*.cpp")  				# extract all file in src/
-FILES	:= $(notdir $(basename $(SRCS)))						# extract the name of the file
-OBJS 	:= $(addprefix $(OBJ_DIR)/,$(addsuffix .o,$(FILES)))	# concat obj/ + FILES + .o
+# [--------------------FUNCTION--------------------] 
+# SRCS extract all file in src/
+# FILES extract the name of the file
+# OBJS concat obj/ + FILES + .o
+SRCS 		:= $(shell find $(SRC_DIR) -name "*.cpp")  				
+FILES		:= $(notdir $(basename $(SRCS)))						
+OBJS 		:= $(addprefix $(OBJ_DIR)/,$(addsuffix .o,$(FILES)))	
+
 
 all: execute
 
 execute: linking
 	@ echo execute...
-	@ $(EXEC)
+	@ ./$(TARGET)
 	@ echo ...terminate
 
 linking: $(OBJS)
 	@ echo linking
 	@ $(CXX) $(WFLAGS) $(OFLAG) $(TARGET) $(OBJS)
 
-$(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp $(OBJ_DIR)
 	@ echo compile $<
 	@ $(CXX) $(WFLAGS) -c $< $(OFLAG) $@ $(INCLUDE)
 
+$(OBJ_DIR):
+	mkdir -p $(OBJ_DIR)
+
 clean: 
-	@ -rm -f $(OBJS)	
+	@ rm -rf $(OBJ)