Lexical Analyzer Help

[Moolan]

How would I go about creating a simple lexical analyzer that takes input files and checks character by character, Identifying each token.
Also I want to use the enum() function. Does someone have an idea how to start the steps

Any tips, ideas, guides, insight, links would be greatly appreciated.

[Ganado]

takes input files and checks character by character, Identifying each token.

Something like this:

#include <iostream>
#include <fstream>
#include <string>

int main()
{
    // "test.txt" presumably contains some characters in it.
    std::ifstream f("test.txt");
    
    char ch;
    while (f.get(ch))
    {
        //
        // Handle different characters from here:
        // http://www.asciitable.com/
        //
        if (ch == '\n') // Newline
        {
            std::cout << "Character: Newline\n";
        }
        else if (ch == '\t') // Tab
        {
            std::cout << "Character: Tab\n";
        }
        else
        {
            std::cout << "Character: " << ch << '\n';
        }
    }
}

Input:

This is a sentence.
This is a new sentence on the next line.

Output:

Character: T
Character: h
Character: i
Character: s
Character:
Character: i
Character: s
Character:
Character: a
Character:
Character: s
Character: e
Character: n
Character: t
Character: e
Character: n
Character: c
Character: e
Character: .
Character: Newline
Character: T
Character: h
Character: i
Character: s
Character:
Character: i
Character: s
Character:
Character: a
Character:
Character: n
Character: e
Character: w
Character:
Character: s
Character: e
Character: n
Character: t
Character: e
Character: n
Character: c
Character: e
Character:
Character: o
Character: n
Character:
Character: t
Character: h
Character: e
Character:
Character: n
Character: e
Character: x
Character: t
Character:
Character: l
Character: i
Character: n
Character: e
Character: .

Also I want to use the enum() function

No idea what that is.
If you want to learn about enums, see:
https://stackoverflow.com/questions/12183008/how-to-use-enums-in-c
http://www.stroustrup.com/C++11FAQ.html#enum

[dutch]

He probably wants to assemble the characters into tokens and identify the token category with enum labels.

enum { Keyword, Operator, .... };

He hasn't given enough info, though.