how to reverse an str in c code example

Example: reverse string efficient in cpp without using function

#include <iostream>
using namespace std;
int main()
{
    char str[] = "Reverseme";
    char reverse[50];
    int i=-1;
    int j=0;
         /*Count the length, until it each at the end of string.*/ 
          while(str[++i]!='\0');
           while(i>=0)
                    reverse[j++]=str[--i];
            reverse[j]='\0';
      cout<<"Reverse of  a string is"<< reverse;
      return 0;
}