Process the yacc grammar file using the -d optional flag (which tells the yacc command to create a file that defines the tokens used in addition to the C language source code):. Perform the following steps, in order, to create the desk calculator example program: The following descriptions assume that the calc.lex and calc.yacc example programs are found in your current directory. Specifies the yacc command grammar file that defines the parsing rules, and calls the yylex subroutine created by the lex command to provide input. Specifies the lex command specification file that defines the lexical analysis rules. The files that contain the example lex and yacc programs are: File This calculator program also allows you to assign values to variables (each designated by a single, lowercase letter) and then use the variables in calculations. Together, these example programs create a simple, desk-calculator program that performs addition, subtraction, multiplication, and division operations. This section describes example programs for the lex and yacc commands. Example Program for the lex and yacc ProgramsĪIX Version 4.3 General Programming Concepts: Writing and Debugging Programs
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