这是C语言课程设计，实现了通讯录及其所有功能，内涵源码，包括增删改以及音乐背景等等、并额外添加了设置帮助等，使其更加全面。-This is a C language program design, implementation, address book and all the features, content source, including additions and deletions as well as background music, etc., and add additio