对于一个词法分析程序,一般读取文件或者终端 一个默认lex程序大致看上去像这样 YY_BUFFER_STATE bp; extern FILE* yyin; ... whatever the program does before the first call to the scanner if(!yyin) yyin = stdin; default input is stdin bp = yy_create_buffer(yyin,YY_BUF_SIZE ); YY_BUF_SIZE def…