reverse a string

// Ansi string only!
void reverse(char* s)
{
	// Get the length of the string
	int len = 0;
	char* p = s;
	while (*p != 0)
	{
		len++;
		p++;
	}
 
	// Swap ...
	int i = 0;
	char c;
	while (i <= len / 2 - 1)
	{
		c = *(s + i);
		*(s + i) = *(s + len - 1 - i);
		*(s + len - 1 - i) = c;
		i++;
	}
}
 
int main()
{
	char s[] = "Hello World!";
	printf("'%s' =>n", s);
	reverse(s);
	printf("'%s'n", s);
	return 0;
}