Usage of const char * const name

[Ferdinend]

In the below mentioned code, my intension is only to use the values which are received as a arguments. But unfortunately, I am able to change the “cStringVal”. How to avoid this?

void setValue(const int * const intVal, const char *  const cStringVal)
{
    int length=0;
 
    //*intVal = 50; //Error Can't change the value
 
 
    //assign the another value
    strcpy(cStringVal, "India");
 
}

[Banfa]

int aninta = 5;
int anintb = 7;
 
/* Constant pointer to a constant integer
   Pointer can not be altered
   Value pointed at can not be altered
*/
const int * const cpc = &aninta;
 
cpc = &anintb;  /* Error */
*cpc = 10;      /* Error */
 
/* Pointer to a constant integer
   Pointer can be altered
   Value pointed at can not be altered
*/
const int * cp = &aninta;
 
cp = &anintb;  /* OK    */
*cp = 10;      /* Error */
 
/* Constant pointer to an integer
   Pointer can not be altered
   Value pointed at can be altered
*/
int * const pc = &aninta;
 
pc = &anintb;  /* Error */
*pc = 10;      /* OK    */
 
/* Pointer to an integer
   Pointer can be altered
   Value pointed at can be altered
*/
int * p = &aninta;
 
p = &anintb;  /* OK    */
*p = 10;      /* OK    */
 

Note that the order of const and int can be interchanged

/* The 2 declarations in each of these two pairs have the same result */
const int * const cpc1;
int const * const cpc2;
 
const int *cp1;
int const *cp2;
 

[Ferdinend]

Hi Banfa,

Thanks to the reply.
You are absolutely correct about integer. So that only already I have commented the second line of my program.

But, like that I should not able to change the character pointer value also. But I am able to change it. (Refer line number 3 of my program). My moto is I should not able to change the "cStringVal" value. How to do this?

Thanks in Advance,
Ferdinend.

[donbock]

Are you getting any errors or warnings from the compiler?
Are you including the header file (string.h) that declares strcpy?
Take a look in that header and check that the prototype is correct. It should be

char *strcpy( char *destination, const char *source );