My solution to CS50 2022 psets-2 readability

readability.c

#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>

int count_letters (string text);
int count_words (string text);
int count_sentences(string text);

int main(void)
{
    // Getting User Inputs
    string text = get_string("Text: ");

    // Output the number of letters in the phrase
    int letters = count_letters(text);

    // Output the number of words in the phrase
    int words = count_words(text);

    // Outout the number of sentence in the phrase
    int sentences = count_sentences(text);

    printf("%i letters\n", letters);
    printf("%i words\n", words);
    printf("%i sentences\n", sentences);

    float L = ((float)letters / (float)words) * 100;
    float S = ((float)sentences / (float)words) * 100;

    int index = round((0.0588 * L) - (0.296 * S) - 15.8);

    printf("Grade %.2f\n", L);
    printf("Grade %.2f\n", S);

    if (index < 1)
    {
        printf("Before Grade 1\n");
    }
    else if (index >= 16)
    {
        printf("Grade 16+\n");
    }
    else
    {
        printf("Grade %i\n", index);
    }
}

// Count the number of letters in the phrase
int count_letters (string text)
{
    int letter_count = 0;

    for (int i = 0; i < strlen(text); i++)
    {
        /*if (text[i] >= 65 && text[i] <= 90)
        {
            letter_count++;
        }
        else if (text[i] >= 97 && text[i] <= 122)
        {
            letter_count++;
        }*/

        if (isalpha(text[i]))
        {
            letter_count++;
        }
    }

    return letter_count;
}

// Count the number of words in the phrase
int count_words (string text)
{
    int word_count = 0;

    for (int i = 0; i < strlen(text); i++)
    {
        if (isspace(text[i]))
        {
            word_count++;
        }
    }

    return word_count + 1;
}

// Count the number of sentences in the phrase
int count_sentences(string text)
{
    int sentence_count = 0;
    for (int i = 0; i < strlen(text); i++)
    {
        if (text[i] == 46 || text[i] == 33 || text[i] == 63)
        {
            sentence_count++;
        }
    }

    return sentence_count;
}