Guess the result of following code.

void test1()

{

  char str[] = "hello"; // string copy.

  printf("%s\n", str);

  *str = 'H';           // copied data would be changed.

}

 

void test2()

{

  char* str = "world"; // static data pointer assignment to str variable.

  printf("%s\n", str);

  *str = 'W';          // static data area would be changed(acccessible or not?).

}

 

int main()

{

  test1();

  test1();

  test2();

  test2();

}

[Result - CodeGear C++Builder 2007 - Release Mode, Optimization None]

hello

hello

world

World

[Result - Microsoft Visual Studio 2005 - Release Mode, Optimization Disabled (/Od)]

hello

hello

world

******************************************************

EXCEPTION_ACCESS_VIOLATION 0xc0000005

Code: 0xc0000005

Flags: Continuable

Exception Record: 0x00000000

Address: 0x00401BC0

Number of Parameters: 2

------------------------------------------------------

Attempt to write inaccessible data at 0x40250c

******************************************************

[Conclusion]

In C++Builder, data in static data area are able to be changed by application source code level in run time, while in Visual Studio, they are not.

[Downlload]

string_test.zip