Lex program to count the number of vowels & consonants from the given input string.
Problem definition:
Write a Lex Program to recognize vowels and consonants in a given string and count them and display the result on standard output.
Structure of LEX Program:
| %{ Definition section %} %% Rules section %% User Subroutine section |
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Source Code – Lex program to the count number of vowels & consonants in a given string
/*Lex program to count the number of vowels & consonants from the given input string.*/
%{
#include<stdio.h>
int vow=0, con=0;
%}
%%
[ \t\n]+ ;
[aeiouAEIOU]+ {vow++;}
[^aeiouAEIOU] {con++;}
%%
int main( )
{
printf("Enter some input string:\n");
yylex();
printf("Number of vowels=%d\n",vow);
printf("Number of consonants=%d\n",con);
}
int yywrap( )
{
return 1;
}Output:
maheshgh@maheshgh:~/LexYacc$ lex demo.l
maheshgh@maheshgh:~/LexYacc$ gcc lex.yy.c
maheshgh@maheshgh:~/LexYacc$ ./a.out
Enter some input string:
VTU Nidasoshi VTU Belagavi
(Note: press control+d after input)
Number of vowels=10
Number of consonants=13
Summary:
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