Preview:
#include <iostream>

int main() {
  int pin;
  std::cout<<"Введите число-пинкод\n";
  std::cin >> pin;
  int sum;
  while(pin !=42 ){
    std::cout << "Error try again:";
    std::cin >> pin;
    }
  if (sum==42){
  std::cout<<"пинкод верный работаем дальше";
    }
  }
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