Help with Hashing

[edithsong]

Hey guys,
Thank you for the many times you guys have helped me.
I've spent an hour or so on this.

The Hash value is being set to 0 regardless of what values are Moded;
As far as I can tell the rest of my code functions properly.

The way this function works is by:
1. Read in a string.
2. Convert string to ascii value.
3. Mod by key.
4. Insert into table(table is a array of linked lists).

// these are defined elsewhere
#define MAX 67;
Table[MAX];

In the display later on it shows all strings set to Table[0].

   while (getline(fin,temp))
   {
      strToDigit = 0;
      // add up all values of string
      strToDigit += atoi(temp.c_str());
      // hash = integervalueofstring % 67 (defined above)
      hash = strToDigit % MAX;
      position = 0;
      while (table[hash].getNumItems() >= position)
      {
         position++;
      }
      table[hash].insert(temp,position);
   }

[Peter87]

If atoi fails it will return 0.

[edithsong]

What might cause it to fail? Any trouble with strings/special cases?

[Peter87]

atoi converts a string that has the form of an integer. It's not really a hash function. If the string contains letters or other non-numerical characters it will probably fail.

[Moschops]

Any trouble with strings/special cases?

Any string that doesn't look like this, basically:

15456353455

Just numbers. No letters.