int     input  = 0;
Number *tmp    = NULL;
start          = NULL;

for (input = 1; input < argc; input++)
{
    if (start == NULL) // start being NULL indicates an EMPTY list
    {
        start  = (Number *) malloc(sizeof(Number)); // allocate new Number
        start -> value = atoi(argv[input]); // assign input into Number
        start -> next  = NULL;  // assign next value as NULL
        tmp    = start;         // tmp is pointing to the end of our list
    }
    else // non-NULL start means a populated list
    {
        tmp -> next    = (Number *) malloc(sizeof(Number)); // allocate new Number, attached at end of list
        tmp            = tmp -> next; // advance tmp pointer to newly allocated Number
        tmp -> value   = atoi(argv[input]); // assign input to new Number in list
        tmp -> next    = NULL; // set next to NULL (should be nothing after end of list)
    }
}