yacc program to convert infix to postfix expression

Which is a yacc file that describes the rules of the grammar that implements We've also included input as a sample input for calc and output is the result of executing calc outputįor this exercise you will only need to modify the file, calc.y,

The key files are Makefile, calc.h, calc.l, and calc.y. Start by creating a directory called calc and copying the files from We also have some comments on running lex Consult the Lex&Yacc Page for lots of information on these useful Unix tools. Understand how they work, you will find that the use of lex and yacc will Problems, even outside the realm of compilers. Lex and yacc are tools which can be used to solve a variety of interesting Takes a concise description of a grammar and produces a C routine that The gnu version which is called flex) is a program that takes a set of descriptions of possible tokensĪnd produces a C routine that implements a scanner. Rules that define the relationships among the tokens. Statements, declarations, blocks, and procedures in the program. Once the tokens are identified, the compiler needs to find the expressions,

The algorithm that divides the program into units isĬalled a lexical analyzer, scanner, or lexer. Into meaningful units, called tokens, and then discover the relationshipĪmong these units. WhenĪ program is presented to a compiler, the compiler has to divide the program Tools for the generation of compilers: lex and yacc. The goal of this exercise is to acquaint yourself with two very powerful

Yacc program to convert infix to postfix expression