Question

Write a lex program to count the number of characters, words, spaces, end of lines in a given input file.

Answer 1

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:

Geeks for Geeks

gfg gfg

Output:

No. of lines=2

No. of spaces=3

No. of tabs=1

No. of other characters=19

Input:

Hello

How are you?

Output:

No. of lines=2

No. of spaces=4

No. of tabs=1

No. of other characters=15