CS50x 2020 Readability

readability.c

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

int main(void)
{
    // Get the text
    string text = get_string("Text: ");

    // counter for number of letter
    int letterCount = 0;

    // Counter for number of word
    int wordCount = 1;

    // Counter for sentence count
    int sentenceCount = 0;


    for (int i = 0 ; i < strlen(text); i++)
    {
        // Check Whether Character is alphabetical or not
        if (isalpha(text[i]))
        {
            letterCount++;
        }

        // Check for space
        if (isspace(text[i]))
        {
            wordCount++;
        }

        // Check for sentence elimination letter
        if (text[i] == 46 || text[i] == 33 || text[i] == 63)
        {
           sentenceCount++;
        }
    }

    // printf("Number of letter: %i\n", letterCount);
    // printf("Number of word: %i\n", wordCount);
    // printf("Number of Sentences: %i\n", sentenceCount);

    float averageLetter = ((float) letterCount/(float) wordCount) * 100;
    float averageWord = ((float) sentenceCount/(float) wordCount) * 100;

    // printf("%.2f\n", averageLetter);
    // printf("%.2f\n", averageWord);

    int index = round(0.0588 * averageLetter - 0.296 * averageWord - 15.8);
    // printf("Index is: %i\n", index);

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

}