[2016-06-20] Challenge #272 [Easy] What's in the bag?

bag.c

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

int main (void)
{
    int tilecount[] = { 9, 2, 2, 4, 12, 2, 3, 2, 9, 1, 1, 4, 2, 6, 8, 2, 1, 6,
                        4, 6, 4, 2, 2, 1, 2, 1, 0, 0, 0, 0, 2 };
    
    char* input = GetString();
    
    // iterate through input and decrememnt the tile count
    for (int i = 0; i < strlen(input); i++)
    {
        if ((input[i] > 64 && input[i] < 91) || input[i] == 95) // check if a valid tile char
            tilecount[(input[i]) - 65]--;
        
        // check if tilecount went below 0. If so print error.
        if (tilecount[(input[i]) - 65] < 0)
        {
            printf("Invalid input. More %c's have been taken from the bag than possible.\n", input[i]);
            return -1;
        }
    }
    
    // print output
    for (int j = 12; j >= 0; j--)
    {
        int printed = 0; // check if count printed out
        
        for (int k = 0; k < 31; k++)
        {
            if (printed == 1)
                if (tilecount[k] == j)
                    if (((k + 65) > 64 && (k + 65) < 91) || (k + 65) == 95) 
                        printf(", %c", k + 65);
            
            if (printed == 0)
                if (tilecount[k] == j)
                {
                    if (((k + 65) > 64 && (k + 65) < 91) || (k + 65) == 95)
                    {
                        printf("%i: %c", j, k + 65);
                        printed = 1;
                    }
                }
        }
        
        if (printed == 1)
            printf("\n");
    }
    
    return 0;
}