Algorithms

static void Main(string[] args)
{
    StringBuilder sb = new StringBuilder();
    int j = 100;
    for (int i = 100; i < 101000; i++)
    {
        if (j > 999) j = 100;
        sb.Append((j*10).ToString() + " ");
        j++;
    }
    string s = sb.ToString();


    int idx = 0;
    int startidx = 0;
    int length = s.Length;
    List<int> nrs = new List<int>((int)(length*0.25));

    var watch = Stopwatch.StartNew();
    do
    {
        if (s[idx] == ' ')
        {
            if(idx>startidx)
                nrs.Add(atoi(s, startidx, idx));
            startidx = idx + 1;
        }
        idx ++;
    }
    while (idx < length);
    Console.WriteLine(watch.ElapsedMilliseconds);
    Console.ReadLine();
}


static int atoi(string c, int start, int len) {
  int res = 0;
  int i = start;
  len += start;
  while (i<len && c[i] >= '0' && c[i] <= '9')
    res = res * 10 + c[i++] - '0';
  return res;
}

PaulowniaK wrote:

How can I improve my code in C++?

PaulowniaK wrote:

CString::Find()

// Args:
//  txt: the string
//  txt_size: the string size (including the NULL terminator)
//  a: the int array
//  max_count: the int array size.
// Returns: the number of found integers.
// Remark: if the string contains more integers than array capacity, only max_count integers will be returned.
int get_all_numbers( const char * txt, int txt_size, int * a, int max_count)
{
  const char * p0 = txt;
  const char * p1 = NULL;
  const char * guard = p0+txt_size-1;
  int count = 0;
  while (p1 < guard && count < max_count)
  {
    a[count++] = (int) strtol(p0, (char**)&p1, 10);
    p0 = p1;  
  }
  return count;
}

123lucy45 wrote:

i need an algorithm itself

Valeriant wrote:

I also read and tried the code from http://en.wikipedia.org/wiki/Ellipse[^], following the links in wikipedia. This function to generate an ellipse is almost the same as DrawClosedCurve() or DrawEllipse(), using that I still can't get the outer most point to put the line.