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A simple calculator using lex and yacc . A grammer that allows calculation with a new Lex specification that recognizes english words:Such that you can now do : Example 5 MINUS 22 PLUS 24 TIMES 54 MULTIPLY 515 DIVIDE 3
pas.l - is the lex filepas.y - i the yacc file
CAVEAT: Operator precedence yot yet handled! (keeping it simple for those new to LEX AND YACC) warning: 16 shift/reduce conflicts
![Yacc Yacc](/uploads/1/2/6/2/126287409/674391629.jpg)
Lex helps write programs whose control flow is directed by instances of. From those used in simple desk calculators to complex programming languages. May 04, 2011 Lex and Yacc Calculator code using Unix Script is simple simulation of Lex and Yacc. An assignment of Software Design Laboratory in Information technology. Lex and Yacc Calculator code using Unix Script is simple simulation of Lex and Yacc. An assignment of Software Design Laboratory in Information technology. Computer Graphics Lab; Object.
Requirements : compatible versions of the cygwin distributions lex/yacc or Flex or Bison
Usage:Commands to create our compiler, pas.exe, are listed below:lex pas.l # create lex.yy.cyacc –d pas.y # create y.tab.h, y.tab.ccc lex.yy.c y.tab.c –o pas.exe # compile/link
![How to run yacc program How to run yacc program](https://s1.manualzz.com/store/data/006909021_1-5970cce8a945f013908c7d1e6deefc88.png)
Acceptable tokens:[0-9]+ { yylval = atoi(yytext);return INTEGER;}[-+/n] return yytext;PLUS return '+';MINUS return '-';TIMES return '';MULTIPLY return '';DIVIDE return '/';[ t] ; /* skip whitespace */