Compilation principle Experiment 2----simplified version of C language grammar

< source programs >->< external declarations > |< Program external declarations >

< external declarations >-> < function definitions >|< definitions >

< external declarations >->< header files >|< macro definitions >

< header file >-> < #include stdio.h>|< #include stdilb.h>|< #include <string>>|< #include Manth.h>

< macro definition >-> < data type >< variables >

< variables >-> < letters >|< Arrays >|< fixed Values >

< function definition >-> < function type >< functions name >< Declaration part (argument) >

< function type >-> < no type (void) >|< int (int) >|< character (char) >|< float (float) >

< function declaration section >-> < Direct declaration >|< Pointer Direct declaration >

< function pointer Direct declaration >-> <*>|< data type * pointer >

< function Direct declaration >-> < data type parameter name (row parameter) >|< no parameter >

< function content >->< Variable description >|< assignment statement >|< operations >|< Statement processing >

< variable description >-> < data type >< variable name >

< Assignment statements >->< variable names >=< letters >|< variable names >=< numbers >|< variable names >=< op-Expressions >

< operations >-> < arithmetic expressions >

< OP expression >-> < variable name >< operator >< variable name >|< number >< operator >< number >|< variable name >< operator >< Digital >

< operators >-><+>|<->|<*>|<\>|<%>

< statement processing >-> < judgment statement >|< Loop statement >|< conditional statement >|< sort expression >

Compilation principle Experiment 2----simplified version of C language grammar