Declaration of strings in C [duplicate]

This question already has answers here: Closed 12 years ago. 开发者_JAVA百科

Possible Duplicates:

Is it possible to modify a string of char in C?

What is the difference between char s[] and char *s in C?

There is something I don't understand about strings and pointers in C.

Suppose I have this declaration:

char str[] = "abc";

Then, if I attempt to modify it this way:

str[0] = 'b';

It will work.

But if I declare the string as a pointer to a char

char* str = "abc"

The attempt above will cause an access violation.

What I'm trying to understand is what exactly is the difference.

Thanks in advance

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In The later example the compiler puts the string in the read only data section, so u can't modify it. But in earlier example you are declaring array of character which resides in stack hence you can modify content of this array.