Lex program to find the Length of a String
Last Updated :
30 Apr, 2019
Problem: Write a Lex program to find the Length of a String
Explanation:
FLEX (Fast Lexical Analyzer Generator) is a computer program that generates lexical analyzers and was written by Mike Lesk and Eric Schmidt. Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language.
Examples:
Input: geeksforgeeks
Output: length of given string is : 13
Input: geeks
Output: length of given string is : 5
Implementation:
%{
#include<stdio.h>
int length;
%}
%%
[a-z A-Z 0-9]+ {length=yyleng; }
%%
int main()
{
yylex();
printf ( "length of given string is : %d" , length);
return 0;
}
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Output:
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