Reverse a c-string string (c++)

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/****************************************************************************************** ******************************************************************************************* Chapter 1 Arrays and Strings * Reverse a c-string string. By: Hamed Kiani (July 14, 2015) ****************************************************************************************** ******************************************************************************************/ #include<iostream> using namespace std; // inplace reverse, time: O(n), space: O(1) // Challenge: write this function using array instead of pointers. void reverse_str(char *str) { char * tail = str; while (*tail !='\0') tail++; tail--; char tmp; while(tail>str) { tmp = *str; *str++ = *tail; *tail-- = tmp; } } // Test it! int main() { char str[] = "Reverse this string!"; cout << "original str: " << str << endl; reverse_str(str); cout << "reversed str: " << str << endl; return 0; }