exception : 0xC0000005: Access Violation

[batista]

Hi,

I am getting the following exception

First-chance exception in TestMansoor.exe: 0xC0000005: Access Violation

When i run the following code

1 int main(void)
2 {
3 char* str1 = "MA";
4 char s = str1[0];
5 str1[0] = 'r';
6 return 0;
7 }

i'm getting exception on line 5. Why?

Bye.

[Sandeep]

batista wrote:

Hi,

I am getting the following exception

First-chance exception in TestMansoor.exe: 0xC0000005: Access Violation

When i run the following code

1 int main(void)
2 {
3 char* str1 = "MA";
4 char s = str1[0];
5 str1[0] = 'r';
6 return 0;
7 }

i'm getting exception on line 5. Why?

str is a constant string , you can only access it. If you want to
change the contents of str, you will either have to declare it as an
array of allocate memory for it.

[Kyle]

batista wrote:

Hi,

I am getting the following exception

First-chance exception in TestMansoor.exe: 0xC0000005: Access Violation

When i run the following code

1 int main(void)
2 {
3 char* str1 = "MA";
4 char s = str1[0];
5 str1[0] = 'r';
6 return 0;
7 }

i'm getting exception on line 5. Why?

Bye.

becouse "MA" is a string iteral, and as such cant be modified, even
though its possilble to get a non const pointer to it for some bizzare
reason

your code is more less equivalent of

((char*)"MA")[0] = 'r';

if you want to get a copy of "MA" what you want to do is
char str1[] = "MA";
now str1[0] is modifiable

[Gianni Mariani]

batista wrote:

Hi,

I am getting the following exception

First-chance exception in TestMansoor.exe: 0xC0000005: Access Violation

When i run the following code

1 int main(void)
2 {
3 char* str1 = "MA";
4 char s = str1[0];
5 str1[0] = 'r';
6 return 0;
7 }

i'm getting exception on line 5. Why?

Line 3 should read:

const char* str1 = "MA";

It is specifically allowed by the standard as your original because of
the volume of legacy code that would otherwise break. (IMHO a bad move
by the standards comittee.)

You can however rewrite line 3 like:

char str1[] = "MA";

.... now you're free to change the three characters that is str1.

[Greg Comeau]

In article <11*********************@g49g2000cwa.googlegroups. com>,
batista <sa*********@gmail.com> wrote:

Hi,

I am getting the following exception

First-chance exception in TestMansoor.exe: 0xC0000005: Access Violation

When i run the following code

1 int main(void)
2 {
3 char* str1 = "MA";
4 char s = str1[0];
5 str1[0] = 'r';
6 return 0;
7 }

i'm getting exception on line 5. Why?

Check out http://www.comeaucomputing.com/techtalk/#stringliteral
--
Greg Comeau / Celebrating 20 years of Comeauity!
Comeau C/C++ ONLINE ==> http://www.comeaucomputing.com/tryitout
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