EJEMPLO CALC EN YACC/BISON
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yacc/bison
EJEMPLO CALC EN YACC/BISON
%{
#include "head.h"
#include "y.tab.h"
void yyerror(char *);
// int yylineno = 1; //en windows se declara
%}
%%
"print" {return PRINT;}
"exit" {return EXIT_COMMAND;}
[+-]?[0-9] {yylval = atoi(yytext); return INTEGER;} /va retornar su valor/ /enteros/
[a-zA-Z] {yylval = yytext - 'a'; return ID;} /retorna su valor en ascii/ /identificadores/
[-+/(){}=/cd^;] {return *yytext;} /retorna lo que trae el puntero/ /operadores/
[ \t] ; /tablulaciones/
[ \n] {yylineno++;} /va incrementando las lineas cuando hay un salto de linea/ /cuenta lineas/
. {ECHO; yyerror("caracter invalido");} /error/ /CUALQUIER OTRA COSA SERA UN ERROR/
%%
int yywrap(void){
return 1;
}
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