C++ palindrom program

#include <stdio.h>
#include <string.h>

int main ()
{
  int a;
  char in[75];
  int b;
  gets (in);
  b = strlen(in);
  bool palindrom = true;
  for(int i = 0; i <= b; i++){
        if(in[i] != in[b-i]){
             palindrom = false;
             }
        }
        if(palindrom == true){
             printf("Je palindrom");
             }
             else{
                  printf("Ni palindrom");
                  }
        
  scanf("%d", &a);
  return 0;
}

#include <iostream>
#include <string>

using namespace std;

int main(int argc, char argv[])
{
    string str;
    cout << "Vpisi string: ";
    getline(cin, str);

    auto i = str.begin();
    auto j = str.rbegin();
    auto sredina = str.begin() + (str.length() / 2);

    while(i != sredina) {
        if (*i != *j) {
            cout << "Ni" << endl;
            return -1;
        }
        ++i; ++j;
    }

    cout << "Je" << endl;

    return 0;
}