目录3.ST基本原理..........................................................................................................................73.1语言描述........................................................................................................................73.1.1语法图.....................................................................................................................73.1.2语法图中的块.........................................................................................................73.1.3规则的意义（语义）..............................................................................................83.2基本元素的语言............................................................................................................83.2.1ST字符组.................................................................................................................83.2.2ST中的标识符.........................................................................................................93.2.2.1标识符的规则...........................................................................................93.2.2.2标识符举例.............................................................................................103.2.3预留标识符...........................................................................................................103.2.3.1保护标识符.............................................................................................113.2.4数字和布尔值.......................................................................................................173.2.4.1整数.........................................................................................................173.2.4.2浮点数.....................................................................................................183.2.4.3指数.........................................................................................................183.2.4.4布尔值.....................................................................................................183.2.4.5数字的数据类型......................................................................................193.2.5字符串...................................................................................................................193.3ST源文件的结构..........................................................................................................203.3.1语句.......................................................................................................................213.3.2注释.......................................................................................................................223.4数据类型..........................................................................................................................233.4.1基本数据类型.......................................................................................................233.4.1.1基本数据类型..........................................................................................233.4.1.2基础数据类型的值的范围限制..............................................................253.4.1.3普通的数据类型......................................................................................263.4.1.4基础系统数据类型................................................
