C++ Lab 2 (Assign value to a letter in a word)

This program request input from the user using the command line, after input is typed the program loops through each character in the word and assigns value using an array, in this case, POINTS.

After that, the program adds all the values omitting non-letters. This program can be useful for a scrabble game.

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


int main(void)
{
    //declarations
    string playerOneWord; //Variable to store input from user
    int wordlength; //How long the string is
    char letter; //Store each letter of the word inputed by user
    int value; //ASCII value of the character
    int accumulatedPoints = 0; //Total points earn for the inputed word
    int letterPoints; //Points earned inputed letter

    //constants
    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};
    const int INVALID_CHARACTER = 0;
    const int GET_CHAR_VALUE_TO_ZERO = 97;
    const int ARRAY_POINTS_START = 0;
    const int ARRAY_POINTS_END = 25;

    //get user input
    playerOneWord = get_string("Player 1: ");

    //calculation
    wordlength = strlen(playerOneWord);

    for (int i = 0; i < wordlength; i++)
    {
        letter = tolower(playerOneWord[i]); //will change each character in the word to lowercase
        value = letter - GET_CHAR_VALUE_TO_ZERO;

        if (value < ARRAY_POINTS_START || value > ARRAY_POINTS_END)
        {
            accumulatedPoints = accumulatedPoints + INVALID_CHARACTER;
            printf("%c = %i => zero value character\n", letter, value);
        }
        else
        {
            letterPoints = POINTS[value];
            printf("%c = %i => %i\n", letter, value, letterPoints);
            accumulatedPoints = accumulatedPoints + letterPoints;
        }
    }


    //output
    printf("%s\n", playerOneWord);
    printf("%i\n", accumulatedPoints);
}