sharon ho c

/*
Again I have to say I do not code in C and I learnt the syntax by how you coded, so there might be places where it wouldn't compile as I wasn't coding alongside with an IDE nor do I have sufficient datasets and modules given in your IDE so I would not be able to debug.
Treat this as pseudocode.
Have fun messing around and learning more about style and optimisation.
Chloe x.
*/

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


// defining functions

int count_letters(char* str); // char* is basically string
int count_words(char* str1);
int count_sentences(char* str2);
int calculate_index(int s, int w, int l);


// the main function

int main(void)
{

  char* text = get_string("Text: ");
  int num_letters = count_letters(text);
  int num_words = count_words(text);
  int num_sentences = count_sentences(text);
  int val_index = calculate_index(num_sentences, num_words, num_letters);


  printf("%i letters(s)\n", num_letters);
  printf("%i words(s)\n", num_words);
  printf("%i sentence(s)\n", num_sentences);

  if (val_index<1)
  {
    printf("Before Grade 1\n");
  }
  else if (val_index>16)
  {
    printf("Grade 16+\n");
  }
  else
  {
    printf("Grade %i\n", val_index);
  }
  return 0;

}

// counting letters

int count_letters(char* str)
{
  int num_letters=0;
  for (int i=0; i<strlen(str); i++)
  {
    if isalnum(str[i])
      {
        num_letters++; // you used a = a + 1, which has a shorthand of a++ which is very useful
      }
  }
    return num_letters;
}

// counting words

int count_words (char* str)
{
  int num_words=0;
  for (int i=0; i<strlen(str); i++)
  {
    if isblank(str[i])
    {
      num_words++; // same as above, changed to ++
    }
  }
    if (str != 0)
    // added the check null function and in your own code you reinitialised number of words which would always return 1
  {
    num_words++; // same as above, changed to ++
  }
  return num_words;
}

// counting sentences

int count_sentences (char* str)
{
  int num_sentences=0;
  for (int i=0; i<strlen(str);i++)
  {
    if (str[i]=='!'||str[i]=='.'||str[i]=='?')
    {
      num_sentences++; // same as above, changed to ++
    }
  }
  return num_sentences;
}

//calculating index
int calculate_index (int s, int w, int l)
// I made it s w l to make it way more readable and line length doesn't get too long
{
  int L = l/w*100; // this would produce unnecessary rounding as type is int so it would be rounded down
  int S = s/w*100; // same issue
  int CLindex= 0.0588 * L - 0.296 * S - 15.8;
  return CLindex;
}