在学习LINUX网络编程的时候我们做了一个聊天系统，当时为了界面更漂亮点，于是在百度上搜索了下关于printf（）函数的用法，和大家分享下：
                          给printf的输出加上些特效比如颜色，可以让打印信息更鲜明，在debug的时候特别有用。
                        颜色：
                        #define NONE         "\033[m" 
                        #define RED          "\033[0;32;31m" 
                        #define LIGHT_RED    "\033[1;31m" 
                        #define GREEN        "\033[0;32;32m" 
                        #define LIGHT_GREEN  "\033[1;32m" 
                        #define BLUE         "\033[0;32;34m" 
                        #define LIGHT_BLUE   "\033[1;34m" 
                        #define DARY_GRAY    "\033[1;30m" 
                        #define CYAN         "\033[0;36m" 
                        #define LIGHT_CYAN   "\033[1;36m" 
                        #define PURPLE       "\033[0;35m" 
                        #define LIGHT_PURPLE "\033[1;35m" 
                        #define BROWN        "\033[0;33m" 
                        #define YELLOW       "\033[1;33m" 
                        #define LIGHT_GRAY   "\033[0;37m" 
                        #define WHITE        "\033[1;37m"
                        比如：
                        printf("\033[31m ####----->> \033[32m" "hello\n" 
                        "\033[m");
                        颜色分为背景色和字体色，30~39用来设置字体色，40~49设置背景：
                                背景色                        字体色
                                40: 黑                          30: 黑
                                41: 红                          31: 红
                                42: 绿                          32: 绿
                                43: 黄                          33: 黄
                                44: 蓝                          34: 蓝
                                45: 紫                          35: 紫
                                46: 深绿                      36: 深绿
                                47: 白色                      37: 白色 
                        记得在打印完之后，把颜色恢复成NONE，不然再后面的打印都会跟着变色。
                         
                        另外，还可以加一些ANSI控制码。加颜色只是以下控制码中的一种：
                        \033[0m   关闭所有属性   
                        \033[1m   设置高亮度   
                        \033[4m   下划线   
                        \033[5m   闪烁   
                        \033[7m   反显   
                        \033[8m   消隐   
                        \033[30m   --   \033[37m   设置前景色   
                        \033[40m   --   \033[47m   设置背景色   
                        \033[nA   光标上移n行   
                        \033[nB   光标下移n行   
                        \033[nC   光标右移n行   
                        \033[nD   光标左移n行   
                        \033[y;xH设置光标位置   
                        \033[2J   清屏   
                        \033[K   清除从光标到行尾的内容   
                        \033[s   保存光标位置   
                        \033[u   恢复光标位置   
                        \033[?25l   隐藏光标   
                        \033[?25h   显示光标
                        printf( CYAN "current function is %s " GREEN " file line is %d\n" NONE,
                                    __FUNCTION__, __LINE__ );
                        fprintf(stderr, RED "current function is %s " BLUE " file line is %d\n" NONE,
                                    __FUNCTION__, __LINE__ );
                            return 0;