13.Lex program to print every words in parenthesis

 The program shows every words in file "new" in parenthesis.

For example

I am going
We are going

becomes

{I} {am} {going}
{We} {are} {going}

%{
   
%}
%%
[a-zA-Z]+ {printf("{%s}",yytext);}
%%

main()
{
extern FILE *yyin;
yyin=fopen("new","r");
yylex();
}