Count the nuber of Sentences and Words using Flex [ lex program part 9 ]

1.How to install Flex for linux ( lexical analyser generators) lex part 1 2.Replace space with $ [ lex program part 2 ] 3. Count the number of lines [lex program part3 ] 4.Count the number of digits [ lex program part 4 ] 5.Accept a string ending with abb [ lex program part 5 ] 6.Remove white spaces from a string using Flex [ lex program part 6 ] 7.Even number of 1's using Flex [ lex program part 7 ] 8.Count the number of signed numbers using Flex [ lex program part 8 ] 9.Count the nuber of Sentences and Words using Flex [ lex program part 9 ]

Program

       

%{
int a=0;
int b=0;
%}
word [a-z]+[ ]
sent [.?!]
%%
{sent} a++,b++;
{word} a++;
%%
void main()
{
printf("Enter the String \n");
yylex();
printf("number of words %d \n",a);
printf("number of sentence %d \n",b);

}
        
    

Output

   

lex even.l
cc lex.yy.c -lfl
./a.out
        
    

 then press CTRL+d

Posted in: Lex tutorial