Incompatible pointer to integer conversion passing 'int on functions

Question

im new to coding and currently working on pset2, readability, and I keep getting this error and can´t find a way to fix it.

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

int count_letters(string a, int b, int c);
int count_words(string a, int b, int c);
int count_sentences (string a, int b, int c);
float index_formula(int letters, int words, int sentences);

int main(void)
{
  string text = get_string("Text: ");
  int length = strlen(text);
  int number_letters = 0;
  int number_words = 0;
  int number_sentences = 0;
  count_letters(text, number_letters, length);
  count_words(text, number_words, length);
  count_sentences(text, number_sentences, length);
  index_formula(count_letters, count_words, count_sentences);
  printf("%f grade\n", index_formula);
}

int count_letters(string a, int b, int c)
{

  for (int i = 0; i < c; i++)
  {
      if (isalpha(a[i]))
      {
          b++;
      }
  }
  return b;
}

int count_words(string a, int b, int c)
{
  for (int i = 0; i < c; i++)
  {
      if ((i == 0 && a[i] != ' ')
      || (i != c - 1 && a[i] == ' ' && a[i + 1] != ' '))
      {
          b++;
      }
  }
  return b;
}

int count_sentences(string a , int b, int c)
{
  for (int i = 0; i < c; i++)
  {
      if (a[i] == '.' || a[i] == '!' || a[i] == '?')
      {
          b++;
      }
  }
  return b;
}

float index_formula(int letters, int words, int sentences)
{
  float L = (letters / words) * 100;
  float S = (sentences / words) * 100;
  float index = (0.0588 * L) (- 0.296 * S) - 15.8;
  return round(index);
}

Im pretty sure im doing it the wrong way, but what im trying to do is (being count_letters; count_words; count_sentences; and index_formula all functions) use the output of each function as an input for index_formula, and then print it, but i keep getting

 error: incompatible pointer to integer conversion passing 'int (string, int, int)' (aka 'int (char *, int, int)') to parameter of type 'int' [-Werror,-Wint-conversion]
    index_formula(count_letters, count_words, count_sentences);

Is there a way to fix it? Sorry if its a really dumb question, but i started programming a few weeks ago, and there is a lot I still dont get. Any help is really appeciated.

Answer 1

You are not saving the value from your functions. What you're doing is the you call the function then the function counts the sentences and returns the count but your not assigning that return value to any variable, so it's basically doing nothing then you're passing you're functions as the arguments for the index function.