Thread: Can we change the value stored at the address stored in a character pointer?

I compiled the following code successfully but its not running :

Code:

void func2() {
    char c = 'b';
    char *p = "Hello";
    *p = c;
    printf("%c\n", *p);
}

I changed the value pointer p refers to, so shouldn't the address stored in it change automatically as well or the character stored at the address, i.e., 'H' be replaced by 'b'? Why is the code not running?

Originally Posted by amit_s95

I compiled the following code successfully but its not running :

Code:

void func2() {
    char c = 'b';
    char []p = "Hello";
    *p = c;
    printf("%c\n", *p);
}

I changed the value pointer p refers to, so shouldn't the address stored in it change automatically as well or the character stored at the address, i.e., 'H' be replaced by 'b'? Why is the code not running?

You cannot modify a string literal, if you want to modify the string, explicity use an array instead.

Code:

char hello[] = "Hello";

Thanks for replying

Originally Posted by Salem

>
Because on all modern machines, string constants like "Hello" are stored in read-only memory. You can't change them.

Wow, I didn't know that, thanks for sharing.