Using the STL generic reverse algorithm with an array : array algorithms « STL Introduction « C++ Tutorial

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2. STL Introduction
3. array algorithms

#include <iostream>
#include <string>
#include <cassert> 
#include <algorithm> // For reverse algorithm
using namespace std;

int main()
{
  char array1[] = "abc";
  int N1 = strlen(array1);
  reverse(&array1[0], &array1[N1]);
  assert (string(array1) == "cba");
  return 0;
}