Lex program to count the number of lines, spaces and tabs
Lex 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.
Let’s the how to count the number of lines, spaces and tabs using Lex.
Example:
Input: Beginner for Beginner gfg gfg Output: Number of lines : 2 Number of spaces : 11 Number of tabs, words, charc : 0 , 5 , 32 Input: Hello How are you? Output: Number of lines : 2 Number of spaces : 8 Number of tabs, words, charc : 0 , 4 , 25
Below is the implementation:
C
/* DESCRIPTION/DEFINITION SECTION */%{#include<stdio.h>int lc=0,sc=0,tc=0,ch=0,wc=0; // GLOBAL VARIABLES%}// RULE SECTION%%[\n] { lc++; ch+=yyleng;}[ \t] { sc++; ch+=yyleng;}[^\t] { tc++; ch+=yyleng;}[^\t\n ]+ { wc++; ch+=yyleng;} %%int yywrap(){ return 1; }/* After inputting press ctrl+d */// MAIN FUNCTIONint main(){ printf("Enter the Sentence : "); yylex(); printf("Number of lines : %d\n",lc); printf("Number of spaces : %d\n",sc); printf("Number of tabs, words, charc : %d , %d , %d\n",tc,wc,ch); return 0;} |
Output: