$colname = GetExcelColumnName(703);
print "colname is : $colname \n";

sub GetExcelColumnName
{
    $columnNumber = $_[0];
	$columnnamestr = "";
    print "column number is : $columnNumber \n";
    $columnNumber = $columnNumber;
    $div = $columnNumber/26;
    my $divstart = 0;
    if($columnNumber%26 == 0)
    { 
      $div = $div - 1;
      $divstart = 1;
    }
	$divcnt = 0;
    if($div >= 1)
	{
		$divcnt = $columnNumber/26;
	}   
	if(($divcnt == 0))
	{
		$columnname = 65-1+$columnNumber;
		$return_str = chr($columnname);

	}
	else
	{
	    if($columnNumber == 26)
		{
			$columnname = 65+$div;
		}
		else{
			$columnname = 65-1+$div;
		}
		$return_str = chr($columnname);
		$mod = $columnNumber%26;
        if($columnname <= 90)
        {
            if(($return_str != 'Z') && ($mod == 0))
            {
                $columnname = 65;
            }
            elsif(($return_str == 'Z') && ($mod == 0))
            {
                $columnname = 90;  
            }
            else{
            $columnname = 65-1+$mod;
            }
            $return_str = $return_str.chr($columnname);
        }
        else
        {
            $return_str = "update logic \n";
        }
	}
	return $return_str;
}