app: main.o Triangle.o Point.o
	gcc main.o Triangle.o Point.o -o app

main.o: main.c Triangle.h Point.h
	gcc -c main.c

Triangle.o: Triangle.c Triangle.h Point.h
	gcc -c Triangle.c

Point.o: Point.c Point.h
	gcc -c Point.c

-------------------------------------------------------

CC = gcc                   # the compiler 
CFLAGS = -Wall             # the compiler flags 
OBJ1 = file1.o utils.o     # object files for the first executable 
OBJ2 = file2.o utils.o     # object files for the second executable

# the first target. Both executable will be made when 'make' is
# invoked with no target     
all: prog1 prog2

# general rule how to compile a source file and produce an object file 
.c.o: 
	$(CC) $(CFLAGS) -c $<

# linking rule for the first executable 
prog1: $(OBJ1) 
	$(CC) $(CFLAGS) $(OBJ1) -o prog1

# linking rule for the second executable
prog2: $(OBJ2) 
	$(CC) $(CFLAGS) $(OBJ2) -o prog2
depend:
	echo -e '\n' >> makefile
	$(CC) -MM *.c >> makefile