Lex Program to accept string starting with vowel
Last Updated :
30 Sep, 2022
Lex is a computer program that generates lexical analyzers. Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language.
The commands for executing the lex program are:
lex abc.l (abc is the file name)
cc lex.yy.c -efl
./a.out
Let’s see lex program to accept string starting with vowel.
Examples:
Input: animal
Output: Accepted
Input: zebra
Output: Not Accepted
Below is the implementation:
% {
int flag = 0;
% }
%%
[aeiouAEIOU].[a-zA-Z0-9.]+ flag=1;
[a-zA-Z0-9]+
%%
main()
{
yylex();
if (flag == 1)
printf ( "Accepted" );
else
printf ( "Not Accepted" );
}
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Output:
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