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2. Lex program that detects statement type i.e. Simple or Compound

By Viksto 
Lex program that detects statement type i.e. Simple or Compound 

Note: Only AND | OR | BUT conjunctions are supported.
Program:
%option noyywrap
%{ 
char test='s';
%}
%%
(""[aA][nN][dD]"")|(""[oO][rR]"")|(""[bB][uU][tT]"") {test='c';}
. {;}
\n return 0;
%%
main()
{
yylex();
if(test=='s')
    printf("\n Its a simple sentence");
else if(test=='c')
    printf("\n This is compound sentence");
}

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