why is the value of sizeof(arr) in maxdiff function = 4 ?
where as in main function it is 24
On Fri, Jul 1, 2011 at 11:05 AM, Vishal Thanki <vishaltha...@gmail.com>wrote:
> Rujin is right, here is the code which compiles..
>
> vishal@ubuntu:~/progs/c\ 11:04:37 AM >$ cat alg.c
> #include<stdio.h>
> int maxdiff(int arr[]);
> int main()
> {
> int p,arr[]={2,4,1,6,23,4};
> p=maxdiff(arr);
> printf("\n MAX Diff is \t %d",p);
> return 0;
> }
> int maxdiff(int arr[])
> {
> int diff=0,len,i,j;
> unsigned p;
> len=sizeof(arr)/sizeof(arr[0]);
> for(i=0;i<len;i++)
> {
> for(j=i;j<len;j++)
> {
> p=arr[j]-arr[i];
> if((p-diff)>0)
> diff=p;
> }
> }
> return diff;
> }
> vishal@ubuntu:~/progs/c\ 11:04:40 AM >$ gcc alg.c -Wall
>
>
> On Fri, Jul 1, 2011 at 7:20 AM, varun pahwa <varunpahwa2...@gmail.com>
> wrote:
> > actually u r passing arr,and receiving arr[] which actually receives the
> > first element address. So arr will be a reference to first address. so
> its
> > size will be 4 bytes and arr size will also be 4 bytes. so ur len
> contains
> > only 1. so ur loop runs only once.i hope it clears.
> >
> > On Thu, Jun 30, 2011 at 4:49 PM, ashwini singh <asingh...@gmail.com>
> wrote:
> >>
> >> still it's not working
> >>
> >> On Thu, Jun 30, 2011 at 4:42 PM, Rujin Cao <drizzle...@gmail.com>
> wrote:
> >>>
> >>> int maxdiff(int );
> >>> int maxdiff(int arr[]);
> >>> The signatures of maxdiff function are not the same.
> >>>
> >>> On Fri, Jul 1, 2011 at 6:53 AM, ashwini singh <asingh...@gmail.com>
> >>> wrote:
> >>>>
> >>>> this code gives an error ([Warning] passing arg 1 of `maxdiff' makes
> >>>> integer from pointer without a cast) . Please explain the reasons.
> >>>>
> >>>>
> >>>> #include<stdio.h>
> >>>> #include<conio.h>
> >>>> int maxdiff(int );
> >>>> main()
> >>>> {
> >>>> int p,arr[]={2,4,1,6,23,4};
> >>>> p=maxdiff(arr);
> >>>> printf("\n MAX Diff is \t %d",p);
> >>>> getch();
> >>>> }
> >>>> int maxdiff(int arr[])
> >>>> {
> >>>> int diff=0,len,i,j;
> >>>> unsigned p;
> >>>> len=sizeof(arr)/sizeof(arr[0]);
> >>>> for(i=0;i<len;i++)
> >>>> {
> >>>> for(j=i;j<len;j++)
> >>>> {
> >>>> p=arr[j]-arr[i];
> >>>> if((p-diff)>0)
> >>>> diff=p;
> >>>> }
> >>>> }
> >>>> return diff;
> >>>> }
> >>>>
> >>>> --
> >>>> with regards,
> >>>> Ashwini kumar singh
> >>>> ECE Final yr.
> >>>> NIT Allahabad
> >>>>
> >>>>
> >>>> --
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> >>
> >>
> >>
> >> --
> >> with regards,
> >> Ashwini kumar singh
> >> ECE Final yr.
> >> MNNIT Allahabad
> >> Mobile: 7505519402
> >>
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> >
> >
> >
> > --
> > Varun Pahwa
> > B.Tech (IT)
> > 7th Sem.
> > Indian Institute of Information Technology Allahabad.
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> >
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