Compilers: Principles and Practice by Pearson

Syntax Analyzer 127

return CONS;

}

if(c == ’\n’)

lineno++;

return c;

}

Compile this program using a command:

gcc -o calculator util1.c calculator.c

In anticipation of our further discussion about yacc in the subsequent chapters, you are strongly

advised to work through Chapter 8, “Program Development” in the book “The UNIX Programming

Environment” by Kernighan and Pike.

4.5 Other Parser Generators

4.5.1 Bison

Bison is a parser generator by GNU organization, similar to yacc, written mainly by Robert Corbett

and Richard Stallman. It is generally upward compatible with input files designed for yacc.

Input files should follow the yacc convention of ...