scrabble.c

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

// Points assigned to each letter of the alphabet
int POINTS[] = {1, 3, 3, 2, 1, 4, 2, 4, 1, 8, 5, 1, 3, 1, 1, 3, 10, 1, 1, 1, 1, 4, 4, 8, 4, 10};

int compute_score(string word);

int main(void)
{
    // Get input words from both players
    string word1 = get_string("Player 1: ");
    string word2 = get_string("Player 2: ");

    // Score both words
    int score1 = compute_score(word1);
    int score2 = compute_score(word2);

    if (score1 > score2)
    {
        printf("Player 1 wins!");
    }
    else if (score2 > score1)
    {
        printf("Player 2 wins!");
    }
    else
    {
        printf("Tie!");
    }
}

int compute_score(string word)
{
    int score = 0;
    for (int i = 0; i < strlen(word); i++)
    {
        // what we need is a normalized list of a-z to match points
        // with "A-Z", int representation (ASCII code) of them are consecutive 65-90
        int upper_word = toupper(word[i]);

        // check if it's within A-Z range,
        // this includes a-z as well since we have already normalized them
        // this comparison will compare with it's int representation
        if (upper_word >= 'A' && upper_word <= 'Z')
        {
            // subtract with charcode of 'A' to get matching points index
            // that is:
            //  if char is A -> 65 - 65 = 0
            //  if char is B -> 66 - 65 = 1
            // and so on..
            int point_index = (int)(upper_word - 'A');
            score += POINTS[point_index];
        }
    }

    return score;
}