in function it is pointer pointing to an array of 6 elements , pointer have
size equal to word size in the system which is 4bytes for 32 bit operating
system
in main it is array of 6 integers so 24 bytes
Don't get confused with same names, see the scope and type of arr in both
On Fri, Jul 1, 2011 at 11:28 AM, shady <sinv...@gmail.com> wrote:
> 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
>> >>>>
>> >>>>
>> >>>> --
>> >>>> You received this message because you are subscribed to the Google
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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.
>> > Ph : 09793899112 ,08011820777
>> > Official Email :: rit2008...@iiita.ac.in
>> > Another Email :: varunpahwa.ii...@gmail.com
>> >
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>> >
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--
Sunny Aggrawal
B-Tech IV year,CSI
Indian Institute Of Technology,Roorkee
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