CS50 : Music

// Helper functions for music
#include <ctype.h>
#include <cs50.h>
#include <string.h>
#include "helpers.h"
#include <stdlib.h>
#include <math.h>
// Converts a fraction formatted as X/Y to eighths
int duration(string fraction)
{
  // The 1st number
  int first = ((int)fraction[0] - 48);
  // The 2nd number
  int second = ((int)fraction[2] - 48);
  //get the answer and return it!
  int answer = (first * 8)/second;
  return answer;
}

// Calculates frequency (in Hz) of a note
int frequency(string note)
{
    int diff = ((int)note[1] - 48) - 4;
    //int diff2 = ((int)note[2] - 48) - 4;
    int pow1/*, noteadd*/;
    //if accidental #
    if(note[1] == '#')
        pow1 = pow(2, 1/12);
    // if accidental b
    if(note[1] == 'b')
       pow1 = pow(2, -1/12);
    //if key : A

    if(note[0] == 'A')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff));
         //If it is an accidental
         else
          return round(440 * pow(2, diff) * pow1);
    }
    else if(note[0] == 'B')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff + 2));
         //If it is an accidental
         if(note[1] == 'b' || note[1] == '#')
          return round(440 * pow(2, diff + 2) * pow1);
    }
    else if(note[0] == 'G')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff - 2));
         //If it is an accidental
         if(note[1] == 'b' || note[1] == '#')
          return round(440 * pow(2, diff - 2) * pow1);
    }
    else if(note[0] == 'F')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff - 4));
         //If it is an accidental
         if(note[1] == 'b' || note[1] == '#')
          return round(440 * pow(2, diff - 4) * pow1);
    }
    else if(note[0] == 'E')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff - 6));
         //If it is an accidental
         if(note[1] == 'b' || note[1] == '#')
          return round(440 * pow(2, diff - 6) * pow1);
    }
    else if(note[0] == 'D')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff - 8));
         //If it is an accidental
         if(note[1] == 'b' || note[1] == '#')
          return round(440 * pow(2, diff - 8) * pow1);
    }
    else if(note[0] == 'C')
    {
        //If it not is an accidental
         if(note[1] != 'b' && note[1] != '#')
          return round(440 * pow(2, diff - 10));
         //If it is an accidental
         if(note[1] == 'b' || note[1] == '#')
          return round(440 * pow(2, diff - 10) * pow1);
    }/*char values[5] = {'C', 'D', 'E', 'F', 'G'};
      for(int a = 0; a < 5; a++)
      {
       if(note[0] == values[a])
        noteadd = 2 * (7 - ((int)values[a] - (int)"A"));
       }
        //If it is not an accidental
        if(note[1] != 'b' && note[1] != '#')
         return round(440 * pow(2, diff2) * pow(2, noteadd/12));
         //If it is an accidental
         if(note[1] == 'b'|| note[1] == '#')
          return round(440 * pow(2, diff2) * pow(2, noteadd/12) * pow1);*/
     return 0;
}

// Determines whether a string represents a rest
bool is_rest(string s)
{
    //Is it a rest?
    if(strcmp(s,"") == 0)
        {
        //It's a rest!
        return true;
        }
    else
       {
        //Nope, not a rest..
        return false;
       }
}