נושא: ASP.NET - שאלה בעיבוד מחרוזות, חיסור מספר

{

int i,res;

string ret;

char[] x;

char ch;

for(i=0;i<str1.Length-1;i++)

{

x = str1.ToCharArray();

ch= x[str1.Length - 1];

}

return "";

}

    int i;
    int n1, n2, d;
    s1 = remove0s(s1);
    s2 = remove0s(s2);
    s2 = s2.PadLeft(s1.Length, '0');
    char[] x1 = s1.ToCharArray();
    char[] x2 = s2.ToCharArray();
    for (i = x2.Length - 1; i >= 0; --i)
    {
        n1 = (int)(x1[i ] - '0');
        n2 = (int)(x2[i ] - '0');
        d = n1 - n2;
        if (d >= 0)
             x1[i ] = (char)(n1 - n2 + '0');
        else
        {
             // in here I'm assuming (s1 > s2), because
             // otherwise there will be an index out of range.
             int removeFromNext = 1 - d / 10; // d in negetive, -d is positive.
             x1[ i] = (char)(d + removeFromNext * 10 + '0');
             x1[i - 1] = (char)(x1[i - 1] - removeFromNext);
        }
    }
    return remove0s(new string(x1));
}

private static string remove0s(string s)
{
    int i = 0;
    int l = s.Length;
    while (i < l && s[ i] == '0')
        ++i;
    return s.Substring(i);
}