Re: [algogeeks] C Function Pointer(Typedef)
The purpose of typedef is to assign alternative names to existing type.
In your case statement " typedef int (*pFunc) (int);" just assign a new
name pFunc to pointer to function declaration " int (*pFunc) (int);". This
statement is not define any variable. Please see below working code.
#include
#include
int func(int);
int main(int count,char *argv[])
{
typedef int (*pFunc) (int);
* pFunc pf;
*
* pf = func;*
getchar();
}
Regards,
Shafi
On Tue, Oct 30, 2012 at 1:41 AM, rahul sharma wrote:
> #include
> #include
>
>
> int func(int);
> int main(int count,char *argv[])
> {
> typedef int (*pFunc) (int);
> pFunc=func;
> getchar();
> }
>
>
>
>
> Y itz not compiling?
>
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Regards,
Shafi Ahmad
http://in.linkedin.com/in/shafiahmad/
"The difficult we do immediately, the impossible takes a little longer" -
US Army
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[algogeeks] C Function Pointer(Typedef)
#include
#include
int func(int);
int main(int count,char *argv[])
{
typedef int (*pFunc) (int);
pFunc=func;
getchar();
}
Y itz not compiling?
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Re: [algogeeks] C Macro
well they should not , if you see it closely pointer p and q
contain contain address of a and x.
and swap() macro will swap value these pointers are holding i.e adress
of a and xbut will it reflect address of a and x ???...NO
so if you print the address p and q ...before and after the swap then
you should see that after swap p will be holding address of x and
q will be holding address of a..that it
On 10/29/12, rahul sharma wrote:
> I have taken form book...i am writing exact code
>
> #include
> #define swap(a,b,c) c t;t=a,a=b,b=t;
>
>
> int main()
> {
> float a,x;
> a=20.0;
> x=30.0;
> float *p,*q;
> p=&a,q=&x;
> swap(p,q,float*);
> printf("%f %f",a,x);
> getchar();
> }
>
> o/p=20.000 30.000
>
>
> why not swapped???
> On Mon, Oct 29, 2012 at 11:01 PM, atul anand
> wrote:
>
>> if you think the your expanded version is incorrect.You are wrong ,
>> because int * will hold pointer but you are not allocating address of
>> x ..instead you are allocating x value as an address of x to *t.This
>> wont work.
>> so to make it work you need to save the address of x and y in temp
>> pointers i.e
>>
>>int *p.*q;
>> p=&x;
>> q=&y;
>> int t;
>> t=*p;
>> *p=*q;
>> *q=t;
>> now you can convert it into macro.
>>
>> On 10/29/12, rahul sharma wrote:
>> > @atul...mistakenly i have put w at place of t in my last post...i wana
>> say
>> >
>> >
>> >
>> > On Mon, Oct 29, 2012 at 10:07 AM, dCoder wrote:
>> >
>> >> Just replace your macro with its definition and you will understand.
>> >>
>> >> its not doing swapping of pointers...plz explain
>> >>
>> >
>> >
>> > @dCode i expanded..but its fine...please tell
>> >
>> >> #include
>> >> #define swap(a,b,c) c t;t=a,a=b,b=t
>> >>
>> >> int main
>> >> int x=10,y=20;
>> >> int *p,*q;
>> >> swap(x,y,int*);
>> >>
>> > int * t;
>> > t=x;
>> > x=y;
>> > y=t;
>> >
>> >
>> > There is int* at the end..there is som problem with my
>> > keyborad...:(.acc to me axpanded version is above..but not
>> swapping
>> > two pointerssplz comment
>> >
>> >
>> >
>> >
>> >> On Sun, Oct 28, 2012 at 9:16 PM, rahul sharma
>> >> wrote:
>> >>
>> >>> its now doing swapping of pointers...plz explain
>> >>>
>> >>>
>> >>> On Sun, Oct 28, 2012 at 8:08 PM, atul anand
>> >>> wrote:
>> >>>
>> it should swap
>>
>> On 10/28/12, rahul sharma wrote:
>> > Why the following code is not able to swap two macros???although
>> > it
>> > is
>> > easily swapping 2 variables
>> >
>> > #include
>> > #define swap(a,b,c) c t;t=a,a=b,b=t
>> >
>> >
>> > int main
>> >
>> >
>> > int x=10,y=20;
>> > int *p,*q;
>> >
>> > swap(x,y,int);
>> >
>> > --
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>> Groups
>> > "Algorithm Geeks" group.
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>> >
>> >
>>
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Re: [algogeeks] C Macro
I have taken form book...i am writing exact code
#include
#define swap(a,b,c) c t;t=a,a=b,b=t;
int main()
{
float a,x;
a=20.0;
x=30.0;
float *p,*q;
p=&a,q=&x;
swap(p,q,float*);
printf("%f %f",a,x);
getchar();
}
o/p=20.000 30.000
why not swapped???
On Mon, Oct 29, 2012 at 11:01 PM, atul anand wrote:
> if you think the your expanded version is incorrect.You are wrong ,
> because int * will hold pointer but you are not allocating address of
> x ..instead you are allocating x value as an address of x to *t.This
> wont work.
> so to make it work you need to save the address of x and y in temp
> pointers i.e
>
>int *p.*q;
> p=&x;
> q=&y;
> int t;
> t=*p;
> *p=*q;
> *q=t;
> now you can convert it into macro.
>
> On 10/29/12, rahul sharma wrote:
> > @atul...mistakenly i have put w at place of t in my last post...i wana
> say
> >
> >
> >
> > On Mon, Oct 29, 2012 at 10:07 AM, dCoder wrote:
> >
> >> Just replace your macro with its definition and you will understand.
> >>
> >> its not doing swapping of pointers...plz explain
> >>
> >
> >
> > @dCode i expanded..but its fine...please tell
> >
> >> #include
> >> #define swap(a,b,c) c t;t=a,a=b,b=t
> >>
> >> int main
> >> int x=10,y=20;
> >> int *p,*q;
> >> swap(x,y,int*);
> >>
> > int * t;
> > t=x;
> > x=y;
> > y=t;
> >
> >
> > There is int* at the end..there is som problem with my
> > keyborad...:(.acc to me axpanded version is above..but not
> swapping
> > two pointerssplz comment
> >
> >
> >
> >
> >> On Sun, Oct 28, 2012 at 9:16 PM, rahul sharma
> >> wrote:
> >>
> >>> its now doing swapping of pointers...plz explain
> >>>
> >>>
> >>> On Sun, Oct 28, 2012 at 8:08 PM, atul anand
> >>> wrote:
> >>>
> it should swap
>
> On 10/28/12, rahul sharma wrote:
> > Why the following code is not able to swap two macros???although it
> > is
> > easily swapping 2 variables
> >
> > #include
> > #define swap(a,b,c) c t;t=a,a=b,b=t
> >
> >
> > int main
> >
> >
> > int x=10,y=20;
> > int *p,*q;
> >
> > swap(x,y,int);
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups
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> >
> >
>
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Re: [algogeeks] C Macro
if you think the your expanded version is incorrect.You are wrong , because int * will hold pointer but you are not allocating address of x ..instead you are allocating x value as an address of x to *t.This wont work. so to make it work you need to save the address of x and y in temp pointers i.e int *p.*q; p=&x; q=&y; int t; t=*p; *p=*q; *q=t; now you can convert it into macro. On 10/29/12, rahul sharma wrote: > @atul...mistakenly i have put w at place of t in my last post...i wana say > > > > On Mon, Oct 29, 2012 at 10:07 AM, dCoder wrote: > >> Just replace your macro with its definition and you will understand. >> >> its not doing swapping of pointers...plz explain >> > > > @dCode i expanded..but its fine...please tell > >> #include >> #define swap(a,b,c) c t;t=a,a=b,b=t >> >> int main >> int x=10,y=20; >> int *p,*q; >> swap(x,y,int*); >> > int * t; > t=x; > x=y; > y=t; > > > There is int* at the end..there is som problem with my > keyborad...:(.acc to me axpanded version is above..but not swapping > two pointerssplz comment > > > > >> On Sun, Oct 28, 2012 at 9:16 PM, rahul sharma >> wrote: >> >>> its now doing swapping of pointers...plz explain >>> >>> >>> On Sun, Oct 28, 2012 at 8:08 PM, atul anand >>> wrote: >>> it should swap On 10/28/12, rahul sharma wrote: > Why the following code is not able to swap two macros???although it > is > easily swapping 2 variables > > #include > #define swap(a,b,c) c t;t=a,a=b,b=t > > > int main > > > int x=10,y=20; > int *p,*q; > > swap(x,y,int); > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. >>> -- >>> You received this message because you are subscribed to the Google >>> Groups >>> "Algorithm Geeks" group. >>> To post to this group, send email to algogeeks@googlegroups.com. >>> To unsubscribe from this group, send email to >>> algogeeks+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/algogeeks?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to algogeeks@googlegroups.com. >> To unsubscribe from this group, send email to >> algogeeks+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] C Macro
@atul...mistakenly i have put w at place of t in my last post...i wana say On Mon, Oct 29, 2012 at 10:07 AM, dCoder wrote: > Just replace your macro with its definition and you will understand. > > its not doing swapping of pointers...plz explain > @dCode i expanded..but its fine...please tell > #include > #define swap(a,b,c) c t;t=a,a=b,b=t > > int main > int x=10,y=20; > int *p,*q; > swap(x,y,int*); > int * t; t=x; x=y; y=t; There is int* at the end..there is som problem with my keyborad...:(.acc to me axpanded version is above..but not swapping two pointerssplz comment > On Sun, Oct 28, 2012 at 9:16 PM, rahul sharma wrote: > >> its now doing swapping of pointers...plz explain >> >> >> On Sun, Oct 28, 2012 at 8:08 PM, atul anand wrote: >> >>> it should swap >>> >>> On 10/28/12, rahul sharma wrote: >>> > Why the following code is not able to swap two macros???although it is >>> > easily swapping 2 variables >>> > >>> > #include >>> > #define swap(a,b,c) c t;t=a,a=b,b=t >>> > >>> > >>> > int main >>> > >>> > >>> > int x=10,y=20; >>> > int *p,*q; >>> > >>> > swap(x,y,int); >>> > >>> > -- >>> > You received this message because you are subscribed to the Google >>> Groups >>> > "Algorithm Geeks" group. >>> > To post to this group, send email to algogeeks@googlegroups.com. >>> > To unsubscribe from this group, send email to >>> > algogeeks+unsubscr...@googlegroups.com. >>> > For more options, visit this group at >>> > http://groups.google.com/group/algogeeks?hl=en. >>> > >>> > >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Algorithm Geeks" group. >>> To post to this group, send email to algogeeks@googlegroups.com. >>> To unsubscribe from this group, send email to >>> algogeeks+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/algogeeks?hl=en. >>> >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to algogeeks@googlegroups.com. >> To unsubscribe from this group, send email to >> algogeeks+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
