makeFile的编写
检查make是否安装：make -v
安装make：sudo apt-get install make
建立makefile文件：vi Makefile
#this is make file
hello.out:max.o min.o hello.c
gcc max.o min.o hello.c -o hello.out
max.o:max.c
gcc -c max.c
min.o:min.c
gcc -c min.c
make执行编译
