CC = gcc
CFLAGS = -Wall -O
OBJ = encrypt.o screenio.o billing.o
BIN = billing

all: $(BIN)
clean: 
	rm -f core $(OBJ) $(BIN) *~

billing: $(OBJ)
billing.o: billing.c billing.h
encrypt.o: encrypt.c encrypt.h
screenio.o: screenio.c screenio.h
