Lex program to find the length of the longest word
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 check valid email.
Examples:
Input: geeks for geeks
Output: 5
Input: facebook google yahoo
Output: 8
Below is the implementation:
% {
int counter = 0; %
}
%
% [a - zA - Z] + {
if (yyleng > counter) {
counter = yyleng;
}
} %
%
main() {
yylex();
printf ( "largest: %d" , counter);
printf ( "\n" );
}
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Output:
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