Lex program to find the length of the longest word
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: Beginner for Beginner Output: 5 Input: facebook google yahoo Output: 8
Below is the implementation:
/*lex code to find the length of the longest word*/ % { int counter = 0; % } % % [a - zA - Z] + { if (yyleng > counter) { counter = yyleng; } } % % main() { yylex(); printf ( "largest: %d" , counter); printf ( "\n" ); } |
Output:
Contact Us