3
Login to rate this answer.
swaant
Answered On : Feb 19th, 2006
ans is 1
Login to rate this answer.
error.since array index cannot be negative
Login to rate this answer.
Prabhu.T.S
Answered On : Sep 1st, 2006
Declaration syntax error in fn. main()
Elements in the array should be seperated by comma while declaration.
Login to rate this answer.
bhoji_005
Answered On : Oct 5th, 2007
main()
{
int a[]={0 1 2 3};
int *b;
b=&a[2];
printf("%d",b[-1]);
}
the ans is :error
why because of ,b[-1] indicates subscript of -1.....
there is no negetive subscrpts.......
Login to rate this answer.
Its a fact that the array index cannot be negative but I ran the program on both Linux compilerand turbo c for both of which I got '1' as the output
can anyone interpret this and explain me the concept plzzzzzzzzz
Login to rate this answer.
Answer will be 1.........
because a[2]=2
and when it will calculate b[-1] answer is 1............
Login to rate this answer.
It's logical and easy. See we have a[] i.e. assigned with a set of values. Now,a pointer b is been referred to the base address of 2nd position of the array's location i.e. the pointer b is a pointer of arrays which store the second location of array as its first location in the pointer's base address i.e. b[0] contains a[2] value as its value thus, the previous value is been stored as its b[-1] value.
So, frnd ans is thus, : 1
Login to rate this answer.
Answer is 2,bcoz b[-1] gives difference of bytes related to address.as b=&a[2];b[-1] indicates one element before and the answer is 2 for gcc
Login to rate this answer.
The answer is : Error
Why because of b[-1] indicates subscript of -1.
There is no negetive subscripts.
Login to rate this answer.
mahamd
Answered On : Apr 15th, 2012
It will give answer 1 because when we give b=&a[2] at that time b take the reference of a[2] and get value 2.
now for b itself works as array and starting its subscript from b[0]=2
now whenever we gives b[-1] means it will give the value after taking resource from a[] so,in b[-1] maens
a[0]=b[-2]
a[1]=b[-1]
a[2]=b[0]
a[3]=b[2]
Login to rate this answer.
The answer is 1. Negative subscripts are definitely allowed in C and C++.
Login to rate this answer.
Answered On : May 1st, 2012
6
Login to rate this answer.
The result will indeed be 1 (a[2] is the third element of the array, so b[-1] will be equivalent to a[1]). There is no restriction against using negative array indices. From the latest online draft of the C language standard (http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf), section 6.5.6, paragraph 8:
"When an expression that has integer type is added to or subtracted from a pointer, the
result has the type of the pointer operand. If the pointer operand points to an element of
an array object, and the array is large enough, the result points to an element offset from
the original element such that the difference of the subscripts of the resulting and original
array elements equals the integer expression. In other words, if the expression P points to
the i-th element of an array object, the expressions (P)+N (equivalently, N+(P)) and
(P)-N (where N has the value n) point to, respectively, the i+n-th and in-th elements of
the array object, provided they exist. Moreover, if the expression P points to the last
element of an array object, the expression (P)+1 points one past the last element of the
array object, and if the expression Q points one past the last element of an array object,
the expression (Q)-1 points to the last element of the array object. If both the pointer
operand and the result point to elements of the same array object, or one past the last
element of the array object, the evaluation shall not produce an overow; otherwise, the
behavior is undened. If the result points one past the last element of the array object, it
shall not be used as the operand of a unary * operator that is evaluated."
Login to rate this answer.
negative subscripts are allowed but the declaration of the array is not right there should be comas between them
Login to rate this answer.
Subscript operators always takes negative number as positive. so ans is 1
Login to rate this answer.
