parity_check.cpp

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, n) for (int i = 0; i < n; i++)


// IMPLEMENT  PARITY CHECK
//  odd parity error
int main (  )
  {
     string s ;
     cout<<"Enter the received string" <<  endl ;
     cin >> s ;

     int n  =  s.length() ;
     vector<int> a(  n  ) ;
     FOR( i , n ) if(  s[i] == '0' ) a[i] = 0 ; else a[i] = 1 ;

     int pa = 0 ;
     FOR( i , n ) pa ^= a[i] ;
     if( pa ) cout<<" Error in recieved string " <<  endl ;
     else cout<<" No error " <<  endl ;


  }