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namespace 네임스페이스명
{
   선언내용; (클래스, 함수, 변수 등을 정의)
}

#include 
using namespace std;
namespace first {
    int value =1;
}
namespace second {
    int value =2;
}
int main() {
    cout << first::value;
    cout << sencond::value;
}

int main() {
    using block = double;
    using chain = int;
      
    block eos = 123.40;
    chain ether = 678;
       
}

inline 반환형 함수명(매개변수 목록);

#include
using namespace std;

class Jacob
{
  void Eat(int SteakWeight);
  inline void EatInline(int SteakWeight);
};

int main(void) {
  Jacob jacob;
  jacob.Eat(500);
  jacob.EatInline(500);
  return 0;
}

void Jacob::Eat(int SteakWeight)
{
  cout << "Eat()::Jacob is " << SteakWeight << "eat g steak" << endl;  
}

inline void Jacob::EatInline(int SteakWeight) {
  cout << "EatInline()::Jacob " << SteakWeight << "eat g steak" << endl;
}

#include 
using namespace std;

Class Jacob {
  public:
    void eat(int steakWeight);
    inline void eatInline(int steakWeght) {
      cout << "eatInline()::Jacob is" << steakWeight << "g steak" << endl;
    }   
};

int main(void)
{
  Jacob jacob;
  jacob.eat(1000);
  jacob.eatInline(1000);
  [](int steakWeight){cout << "eatLamda()::Jacob is eating" << steakWeight << "g steak" << endl;}(1000);
  return 0;
}

void Jacob::eat(int steakWeight){
  cout << "eat()::Jacob eat " << steakWeight << "g steak" << endl;
}