HI Shiva,
Please find little correction in my last post.
uType should be stored outside the Union.
it should be like this.
There is no as such way to know what type of value is stored in the Union
(as per my knowledge)
But you can try the following code in order to keep track.
enum { INT, FLOAT, CHAR } uType;
uType m_dataType;
union UserData
{
int m_intValue;
float m_floatValue;
char m_charValue;
}; data
So whoever update the UserData union he should update the uType variable as
well and while accessing the value following trick can be used:
if (m_dataType == INT)
printf("%d\n", data.m_intValue);
if (m_dataType == FLOAT)
printf("%f\n", data.m_floatValue);
if (m_dataType == CHAR)
printf("%c\n", data.m_charValue);
else
printf("bad type %d in utype\n", utype);
I hope this will solve your case.
Thanks & Regards,
Rajiv Podar
On Tue, Feb 22, 2011 at 12:59 PM, Rajiv Podar <rajeevpo...@gmail.com> wrote:
> Hi Shiva,
>
> There is no as such way to know what type of value is stored in the Union
> (as per my knowledge)
> But you can try the following code in order to keep track.
>
> enum { INT, FLOAT, CHAR } uType;
>
> union UserData
> {
> uType m_dataType;
> int m_intValue;
> float m_floatValue;
> char m_charValue;
> }; data
>
> So whoever update the UserData union he should update the uType variable as
> well and while accessing the value following trick can be used:
>
>
> if (m_charValue.m_dataType == INT)
> printf("%d\n", data.m_intValue);
> if (m_charValue.m_dataType == FLOAT)
> printf("%f\n", data.m_floatValue);
> if (m_charValue.m_dataType == CHAR)
> printf("%c\n", data.m_charValue);
> else
> printf("bad type %d in utype\n", utype);
>
>
>
> I hope this will solve your case.
>
>
> Thanks & Regards,
> Rajiv Podar
>
>
>
> On Tue, Feb 22, 2011 at 12:15 PM, shiva <shivanand.kadwad...@gmail.com>wrote:
>
>> I have an union with following members
>>
>> union data
>> {
>> int age;
>> char grade;
>> }var;
>>
>> now after some operation which assign value to var(it can assign it
>> either age or grade), is there any way i can identify whether var
>> contain age or grade now.
>>
>> Thanks for the comments..
>>
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