%{
int nc=0;
int nl=0;
int nw=0;
%}
%%
"if"|"else"|"while"|"do"|"auto"|"double"|"int"|"struct"|"break"|"else"|"long"|"switch"|"case"|"enum"|"register"|"typ>
[!@#$^&()_~'";:] {printf("%s is a SPECIAL CHARACTER\n", yytext);}
[+*/=%-] {printf("%s is an OPERATOR\n", yytext);}
[0-9]* {printf("%s is a CONSTANT\n", yytext);}
[a-zA-Z]* {printf("%s is an IDENTIFIER\n", yytext);}
\"([^"})*\" {printf("%s is STRING LITERAL\n", yytext);}
\n {nl++;nc+=yyleng;}
[^\n" "\t]+ {nw++;nc=nc+yyleng;}
. {nc++;}
%%
int yywrap()
{}
int main(int argc,char* argv[])
{
 
yyin=fopen(argv[1],"r");
yylex();
printf("\nNo. of lines is %d\n", nl);
printf("\nNo. of words is %d\n", nw);
printf("\nNo. of characters is %d\n", nc);
return 0;
}
 
 

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