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Char a[] = "abc"; Here is is stored on stack.
and sizeof a is 4.. It counts \0

char *a = "abc" --- a is stored on stack. But abc is a const string... Its stored in initialized data segment.

for a[]: sizeof(a) 4 size of array of 4 chars including '\0' is 4
for *a : sizeof(a) 4 size of pointer is 4

void main()
{
char a[]="abcdef";
char *b="abcdef";
printf("%d",sizeof(a)); ------> 6+1=7
printf("%d",sizeof(b)); ------> sizeof(pointer) which is 4
printf("%d",sizeof(*b); -------> 1
}

I guess, the difference between (1) Char a[]=”abc” and (2) char *a=”abc” is that,

(1) is a constant with size of 3 chars.
(2) is variable with variable size.(3 chars in this case)


to answer second part of the question i will copy/paste from
http://www.lysator.liu.se/c/c-faq/c-2.html
<paste>
The array declaration "char a[6];" requests that space for six characters be set aside, to be known by the name "a." That is, there is a location named "a" at which six characters can sit. The pointer declaration "char *p;" on the other hand, requests a place which holds a pointer. The pointer is to be known by the name "p," and can point to any char (or contiguous array of chars) anywhere.
</paste>

It should be 4 due to \0 at the end of the string

"a" in "a[]" is a constant pointer to a char , it cant be dereferenced . where as "a" in "*a" is a normal pointer to char it can be dereferenced.
you can change content of a[] where all the char from literal are4 copied to a char array . but you can not change "abc" which is a literal constant.

Char a[] = "abc"; Here is is stored on stack.
and sizeof a is 4.. It counts \0

char *a = "abc" --- a is stored on stack. But abc is a const string... Its stored in initialized data segment.

I agree with gomchal

go to this page for a very elaborate & clear answer
http://home.netcom.com/~tjensen/ptr/ch6x.htm

Dear friends remember sizeof() works only at compile time .Both are stored in stack .

3 and 2

plz dont post bullshit here... it kind of confuses people.
sizeof -> char[] a will return 4 (abc\0)
-> char *a will return sizeof pointer
-> sizeof(*a) will return 1

In char a[]="abc",space is allocated for three characters and terminated with a NULL character.In char *a="abc",a is a pointer to the string.Hence in this declaration, a can be made to point to a different string whereas in the first declaration,a cannot be assigned to another string directly.It can be done only through strcpy...

en . wikipedia . org / wiki / Data_segment