51单片机交通灯 红绿灯设计 程序+电路图+PROTUES仿真下载

main.c(2): 警告 C318: can't open file 'use.h'
main.c(3): 警告 C318: can't open file 'main.h'
main.c(4): 警告 C318: can't open file 'time.h'
main.c(5): 警告 C318: can't open file 'key.h'
打不开文件是什么原因呀

还是有错误呀

源文件怎么编写呀