This is a great interpreter example which can do arithmetic operations (+, -, /, *) To compile and execute run type "./Makefile" to terminal or type "make compile". To execute, type "./myInterpreter" to terminal.
The EBNF form of The language
!! PROGRAM, DEGISKENLER, KOMUTLAR, OKU, YAZ, TOPLA, CIKAR, CARP, BOL are keywords.
Program → PROGRAM id; Declaration_Section Main_Section
Declaration_Section → DEGISKENLER [Variable List]; Variable_List → Variable_Def | Variable_Def, Variable_List Variable_Def → Variable_Name [ ESITTIR int_literal] Variable_Name → id
Main_Section → KOMUTLAR {Statement;} Statement → Input_Stmt | Output_Stmt | Assignment_Stmt Input_Stmt → OKU ’message’ Variable_Name Output_Stmt → YAZ ’message’ [Expression] Assignment_Stmt → Variable Name <-- Expression Expression → InfixExp | PostfixExp InfixExp → Term | InfixExp (ARTI | EKSI) Term Term → Factor | Term (CARPI | BOLU) Factor Factor → int_literal | Variable Name | (InfixExp) PostfixExp → PostfixExp PostfixExp Operator PostfixExp → int_literal| Variable_Name Operator → (TOPLA | CIKAR | CARP | BOL)