flex 1 输入统计

flex与bison中文版

%{

int chars = 0;

int words = 0;

int lines = 0;

%}

%%

"exit" {return EDQUOT;}

"quit" {return EDQUOT;}

[a-zA-Z]+ {

words++;

chars += strlen(yytext);

}

\n {

chars++;

lines++;

}

. {

chars++;

}

%%

int main(int args, char **argv[])

{

yylex();

printf("lines = %6d words = %6d chars = %6d\n", lines, words, chars);

return 0;

}

int yywrap()

{

return 1;

}

flex letext.l

gcc -lfl lex.yy.c -o letext