int main(int argc,const char *argv[])
{
  FILE *src = input_from_args(argc, argv);

    if (src == NULL)
    {
        printf("%s", "Invalid Source");
        exit(EXIT_FAILURE);
    }
    else
    {
    struct stack * equation = NULL;
    equation = (struct stack*)malloc(sizeof(struct stack));
    equation -> top = -1;

    int i;
    int c;
    while( argv[i] != NULL)
    {
      c = *argv[i];
      i++;
      push(equation,c);
    }

    if(strcmp(argv[1],"-e") == 0)
    {
      evaluate(equation);
      printf("%i n", pop(equation));
    }
    else if(strcmp(argv[1],"-c") == 0)
    {
      convert(equation);
    }
    else if(strcmp(argv[1],"-g") == 0)
    {
      other(equation);
    }
    }

    return EXIT_SUCCESS;
}