Thread: pointer to pointer that points to a char array

Hello,

I have been experimenting with pointer to pointers that point to an int. That bit I understand.

However, when I try and dereference the pointer to get the string value, the program crashes.

Code:

void error_msg(char **msg)
{
                printf("**msg: %s\n", **msg); //dereference to get the string
	printf("*msg: %p\n", *msg); //display the address
}

I am calling the function like this:

Code:

	char msg_error[] = "Message";
	char *msg = msg_error;
	error_msg(&msg);

When I was experimenting with integers I was doing like this:

Code:

void error_int(int **myInt)
{
                //**myInt dereferences and *myInt displays the address
	printf("*myInt address: %p value: %p\n", myInt, *myInt);
	printf("**myInt address: %p value: %d\n", *myInt, **myInt);
}

I guess for arrays you have to do something different.

Many thanks,

Steve

The %s conversion specification expects a pointer to a NULL terminated string but the argument you supplied is **msg which is a char.
Either change the conversion specification to %c or make the argument to printf() a pointer to char *msg.