CS50 Problem Set 2 (Fall 2019) - Readability

Readability.c

//CS50 Problem Set 2 (Fall 2019): Readability
//Author: teeschorle

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

int main(void)
{
    string text = get_string("Text: ");
    int letterscount = 0;
    int wordcount = 1;
    int sentencecount = 0;

//count words
    for (int i = 0; i < strlen(text); i++)
    {
       if ((text[i] >= 'a' && text[i] <= 'z') || (text[i] >= 'A' && text[i] <= 'Z'))
       {
           letterscount++;
       }
       else if (text[i] == ' ')
       {
           wordcount++;
       }
       else if (text[i] == '.' || text[i] == '!' || text[i] == '?')
       {
           sentencecount++;
       }
    }
//    printf("letters: %i; words: %i; sentences: %i\n", letterscount, wordcount, sentencecount);

    float grade = 0.0588 * (100 * (float) letterscount / (float) wordcount) - 0.296 * (100 * (float) sentencecount / (float) wordcount) - 15.8;
    if (grade < 16 && grade >= 0)
    {
        printf("Grade %i\n", (int) round(grade));
    }
    else if (grade >= 16)
    {
        printf("Grade 16+\n");
    }
    else
    {
        printf("Before Grade 1\n");
    }

}

I'm quite confused about Line 19. How would the computer be able to determine letters larger than 'a' or smaller than 'z', or will it automatically translate to ACSII? Thanks :)

@naaomiwang
Yes.

hi guys.....why does int count_words have to be 1 and count_letter and count_words is 0????

Hey, so Word count is starting when the program sees a space using this:

else if (text[i] == ' ') { wordcount++; }

Remember, the word before the first space will not be counted so you have to start from 1.

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

int main(void)
{
int i;
string text;
do
{
text = get_string("Text: ");
}
while (text[0] == '\n' || text[0] == ' ' || text[0] == '\0' || ispunct(text[0]));

int len = strlen(text);
float letters = 0, words = 1, sentences = 0;

for (i = 0; i < len; i++)
{
    // count letters
    if (isalnum(text[i]))
    {
        letters++;
    }

    // count words
    else if (isspace(text[i]) && text[i + 1] != '\0')
    {
        words++;
    }

    // count sentences
    else if (text[i] == '.' || text[i] == '?' || text[i] == '!')
    {
        sentences++;
    }
}

float index, L, S;
// evaluate average number of letters per 100 words
L = (letters / words) * 100;

// evaluate average number of sentences per 100 words
S = (sentences / words) * 100;

// evaluate the Coleman-Liau Index
index = 0.0588 * L - 0.296 * S - 15.8;

/* printf("Letters: %.2f\nWords: %.2f\nSentences: %.2f\nGrade %.0f\n", letters, words, sentences, round(index)); */

// for index value less than 1, print "Before Grade 1"
if (index < 1)
{
    printf("Before Grade 1\n");
}

// for index value more than 16, print "Grade 16+"
else if (index > 16)
{
    printf("Grade 16+\n");
}

// if neither of the above cases, print the index value obtained
else
{
    printf("Grade %.0f\n", index);
}

}

Here's my code for this. Would appreciate any comments/feedback/suggestions.
Thanks :)

thanks man
appreciate it man