>>>How cal i find out returned answer is integer or decimal value..!!!!
>>>
>>>Thanks...
>>
>>The return type will, obviously, always be double. But maybe for what I think you are asking:

bool IsInt = ((int)ans) == ans;

but you should check that ans is not outside the integer range
>
>I was thinking you may try using Int.TryParse

That would require converting the double to a string so would probably be slower. OTOH if you actually wanted to convert to the int type.....

int i2;
bool IsInt = int.TryParse(ans.ToString(),out i2);