#include <iostream>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
struct Third
{
 int first;
 double second;
 bool third;
};
struct Second
{
 Third fifth;
 char other;
};
Second fourth = {{1,2.2,true},'F'};
void p(Second zero)
{
 int &a = zero.fifth.first;
 double &b =zero.fifth.second;
 bool &c = zero.fifth.third;
 std::cout<<"Third: "<<a<<"\n";
 std::cout<<"Second: "<<b<<"\n";
 std::cout<<"First: "<<c<<"\n";
 std::cout<<"Four: "<<zero.other;
}
int main()
{
 p(fourth);
 return 0;
}

//Код сверху пропускает без проблем с ожидаемым результатом,

//но код снизу вызывает краш в месте инициализации переменной (Second fourth). Коды практически идентичны, объясните, что не так? Error: unknown type name 'fourth'

#include <iostream>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
struct Third
{
 int first;
 double second;
 bool third;
};
struct Second
{
 Third fifth;
 char other;
};
Second fourth;
fourth.fifth.first = 1;
fourth.fifth.second = 2.2;
fourth.fifth.third = true;
fourth.other ='f';
void p(Second zero)
{
 int &a = zero.fifth.first;
 double &b =zero.fifth.second;
 bool &c = zero.fifth.third;
 std::cout<<"Third: "<<a<<"\n";
 std::cout<<"Second: "<<b<<"\n";
 std::cout<<"First: "<<c<<"\n";
 std::cout<<"Four: "<<zero.other;
}
int main()
{
 p(fourth);
 return 0;
}