Thread: How to NOT reverse a string in place.

The way I understand reversing a string in place is that when you reverse a string, you modify the original. On the other end, when you don't reverse a string in place, you use more memory, but still have the original string. Maybe I'm being really stupid on this, but I don't see how the latter can be done.

Even if I go something like

Code:

void reverse (char s[]) {
/*code*/
}

int main(void) {
char buffer[] = "stringy";
reverse(buffer);
return 0;
}

I still modify buffer (ie no longer have the original string).

Get the length of the string - 1.
And just implement that into a for loop with another variable initialized to 0 and increment that while decrementing the length.
Using a temp variable you can just work your way through the string.

That's the K&R way to reverse a char array but you end up modifying the original.


To save the original... then just don't use it write up a function expecting a pointer to the original and a pointer to the destination.
Get the strlen of the original - 1. move the dest pointer that amount and just work your way through each at the same time within a loop.


Although it would be the same as copying the original to another and then reverse the second.

Okay, I had to re-read that response a few times before it sunk in. But what you said works.

Thanks