//下面定義保留，為簡化程序，使用字符指針數組保存所有保留字。
//如果想增加保留字，可繼續添加，并修改保留字數目
#define keywordSum  13
char *keyword[keywordSum]={ "begin","if","end","else","then","for","while","to","do","and","not","or","write"};