编程技巧之—顺序读取文件中的每行

int i = 0;

while (fgets (buf, MAX_DATA, in))
        {
            switch (i)
            {
                case 0:
                    bitrate = atof (buf);
                    i++;
                    break;
                case 1:
                    if (buf[strlen(buf)-1] == '\r' || buf[strlen(buf)-1] == '\n')
                        buf[strlen(buf)-1] = 0;
                    strncpy (cname, buf, sizeof(cname));
                    i++;
                    break;
                default:
                    buf[MD5_LEN] = 0;
                    //我觉得这个是最核心的

                    if ((pc = getProgrambymd5 (buf, MD5_LEN)) != NULL)
                    {
                    //这里的i的用法?

                        pchannel[i-2] = pc;
                        i++;
                    }
                    break;
            }
        }

这个是在项目中看到的，个人觉得用的很经典，这样就顺序的读取每一行，对每行执行不同的操作