Lex Program to recognize whether a given sentence is simple or compound
Problem definition:
Write a Lex Program to recognize whether a given sentence is a simple or compound sentence. Print the result on standard output.
A simple sentence is one that does not contain another sentence as a component. These sentences are represented by capital letters A-Z.
A compound sentence contains at least one simple sentence as a component, along with connecting keywords such as and, if, but, because, then, etc.
Structure of LEX Program:
| %{ Definition section %} %% Rules section %% User Subroutine section |
Click here to learn – How to Compile & Run LEX / YACC Programs on Windows 8, 10, and 11?
Lex Program to recognize whether a given sentence is simple or compound
/*Program to recognize whether a given sentence is simple or compound.*/
%{
#include<stdio.h>
int flag=0;
%}
%%
and |
or |
but |
because |
if |
then |
nevertheless { flag=1; }
. ;
\n { return 0; }
%%
int main()
{
printf("Enter the sentence:\n");
yylex();
if(flag==0)
printf("Simple sentence\n");
else
printf("compound sentence\n");
}
int yywrap( )
{
return 1;
}Output:
maheshgh@maheshgh:~/LexYacc$ lex demo.l
maheshgh@maheshgh:~/LexYacc$ gcc lex.yy.c
maheshgh@maheshgh:~/LexYacc$ ./a.out
Enter the sentence:
My name is Mahesh Huddar and I am from India
(Note: press control+d after input)
Compound sentence
maheshgh@maheshgh:~/LexYacc$ ./a.out
My name is Mahesh Huddar
(Note: press control+d after input)
Simple sentence
Summary:
This article discusses how to write a lex program to find whether a given statement is simple or compound If you like the article, do share it with your friends.