function pointers

[rohinip]

hi all...

can anyone help me out regarding passing function pointer as argument to a function?

[gpraghuram]

Hi,
You shuld pass the prtotype of the function pointer as argument

 
int add(int x)
{
}
int calladd(int (*fun)(int))
{
}
main()
{
calladd(add);
}
 

Thanks
Raghuram

[rohinip]

Thank you Raghuram...

Its working!! I have a new problem. It seems its possible to access a float variable using a char pointer. If so, how can I get the 4 bytes of float variable value using char pointer with each byte separately and 2 hex digits in each byte...
Hope am clear..

Regards,
Rohini

Hi,
You shuld pass the prtotype of the function pointer as argument

 
int add(int x)
{
}
int calladd(int (*fun)(int))
{
}
main()
{
calladd(add);
}
 

Thanks
Raghuram

[AdrianH]

Thank you Raghuram...

Its working!! I have a new problem. It seems its possible to access a float variable using a char pointer. If so, how can I get the 4 bytes of float variable value using char pointer with each byte separately and 2 hex digits in each byte...
Hope am clear..

I guess you are clear enough.

My question is, why do you want to access a float variable using a char pointer? One doesn't just wake up one day and say, "Hey! I think it would be neat-o to read a float using a char pointer." You should have a good reason for it. Bypassing the type safety system is not usually a good idea if you can do it another way. Also, doing what you are asking may not be what you are wanting anyway.

Let me know,


Adrian

[rohinip]

Hi Adrian

Sorry for the delay. Actually I have a problem in which I have to display all four bytes of a float variable as four 2 digit hex numbers using a pointer.So, I guessed it can be done using char pointer. Is it actualy possible with char pointer? If not, how can it be done?

Regards,
Rohini

I guess you are clear enough.

My question is, why do you want to access a float variable using a char pointer? One doesn't just wake up one day and say, "Hey! I think it would be neat-o to read a float using a char pointer." You should have a good reason for it. Bypassing the type safety system is not usually a good idea if you can do it another way. Also, doing what you are asking may not be what you are wanting anyway.

Let me know,


Adrian

[AdrianH]

Hi Adrian

Sorry for the delay. Actually I have a problem in which I have to display all four bytes of a float variable as four 2 digit hex numbers using a pointer.So, I guessed it can be done using char pointer. Is it actualy possible with char pointer? If not, how can it be done?

Regards,
Rohini

So you really do want the binary access to the float. Yes, you use a char pointer. You have to cast the float pointer to a char pointer and then (usually) assign that char pointer to an char pointer variable. Then you can use that pointer variable as you would an array.


Adrian