How to create a makefile that will place object code in different folder - makefile

Question

I am very new to Makefile. I had build the following makefile(Which don't work).I wan't put genarated object codes in differnt folder(the folder is in current directory).
$ ls
main.cpp Makefile object_code Time.cpp Time_.h
how can I do this ??
VER = Debug
CC = g++
OBJECTFIELS = ./object_code/main.o ./object_code/Time.o
../$(VER)/main: $(OBJECTFIELS)
$(CC) $(OBJECTFIELS) -o $#
$(OBJECTFIELS): Time_.h
./object_code/main.o: main.cpp
./object_code/Time.o: Time.cpp
clean:
rm $(OBJECTFIELS) main
this is error.
$ make
g++ ./object_code/main.o ./object_code/Time.o -o ../Debug/main
g++: error: ./object_code/main.o: No such file or directory
g++: error: ./object_code/Time.o: No such file or directory
g++: fatal error: no input files
compilation terminated.
Makefile:8: recipe for target '../Debug/main' failed
make: *** [../Debug/main] Error 1
please this is last question.

Answer 1

I don't see how you can possibly get that output given the makefile you've posted here.
Either the object files already exist in which case the link will succeed rather than printing that error.
Or the object files don't exist in which case make will complain because it doesn't know how to make them. There must be some difference between the makefile you're using and the one you've posted here.
In any event, make knows how to build a file foo.o from a file foo.cpp for any string foo. There's a built-in rule that tells it how to do that.
But, make doesn't know how to build a file ./object_code/foo.o from a file foo.cpp, regardless of foo. There's no built-in rule that tells make how to build object files in some random other directory. If you want make to do that, you'll have to tell it how. You should remove the lines:
./object_code/main.o: main.cpp
./object_code/Time.o: Time.cpp
and replace them with a pattern rule describing how to build object files into the object_code directory (I'm using CXX as the compiler variable here: by convention CC is the C compiler and CXX is the C++ compiler, and you should always stick with convention unless there's a good reason not to):
VER = Debug
CXX = g++
OBJECTFIELS = ./object_code/main.o ./object_code/Time.o
../$(VER)/main: $(OBJECTFIELS)
$(CXX) $(OBJECTFIELS) -o $#
$(OBJECTFIELS): Time_.h
./object_code/%.o : %.cpp
$(CXX) -c -o $# $<
clean:
rm $(OBJECTFIELS) main