C# 进制转换 （没有数值的长度限制）

　　　　 static string DecimalismConversion(string x, int y)
        {
            Stack stack = new Stack();

            int length = Int64.MaxValue.ToString().Length - 2;

            while ( x!="")
            {
                string quotient = string.Empty;
                string remainder = string.Empty;
                int count = 0;
                Int64 i64 = 0;
                while (count * length < x.Length)
                {
                    string str = x.Substring(count * length, Math.Min(length, x.Length - count * length));
                    i64 = Convert.ToInt64(remainder + str);
                    remainder = (i64 % y).ToString();
                    quotient += (i64 / y).ToString().PadLeft(str.Length, ‘0‘);
                    count++;
                }
                Int64.TryParse(remainder, out i64);
                if (i64 % y < 10) stack.Push((char)(i64 % y + 48));
                else stack.Push((char)(i64 % y + 55));
                x = quotient.TrimStart(new char[] { ‘ ‘, ‘0‘ });
            }

            return new string(stack.ToArray());
        }

int main(int x,int y) 
{  
    int i=0;
    char a[17]; 
    printf("Input:"); 
L: 
    scanf("%d %d",&x,&y); 
    if(x<=0||y<=2||y>=33)
    {
        printf("Input error,input again:");
        goto L;
    } 
    while(x!=0)
    { 
        if(x%y<10)
            a=(char)(x%y+48); 
        else
            a=(char)(x%y+55); 
        x=x/y; 
    } 
    for(i=i-1;i>=0;i--)
        printf("%c",a); 
    putchar(‘\n‘); 
}