int a = 5;

int a = 5;

#include <iostream>
int main(){
        int x=777;
        std::cout << &x << std::endl;
        //std::cout << *(int *)(0x7fffffffdc54) << std::endl;
        std::cout << *&x << std::endl;
        std::cout << &*&x << std::endl;
        std::cout << *&*&x << std::endl;
        //std::cout << *(0x7fffffffdc54) << std::endl; // CE
        //std::cout << *x << std::endl;  // CE
        //std::cout << **&*&*&x << std::endl; // CE
        //std::cout << *(int *)x << std::endl; // RE
}                   
/* Output  -- Answers are here.
0x7fffffffdc54
777
777
0x7fffffffdc54
777
*/

int x = 7;
int *a = &x;
int **b = &a;
std::cout << *a << std::endl;
*a = 5;
std::cout << **b << std::endl;

int* a, b;
// 上下兩個等價
int *a;
int b;
// 所以宣告兩個指標要
int *a, *b;

#include <iostream>
int is_admin = 0;
int ary[160];
int main(){
  std::cout << sizeof(char) << std::endl;
  std::cout << sizeof(int) << std::endl;
  std::cout << sizeof(long long) << std::endl;
  std::cout << sizeof(float) << std::endl;
  std::cout << sizeof(int *) << std::endl;
  std::cout << sizeof(double *) << std::endl;
}
// 1 4 8 4 8 8

#include <iostream>
int a;
int main(){
    char c;
    // 想辦法算出 &a - &c
}

int a = 5;

int a[4] = {0};

int a[4] = {0};

int a[4] = {0};
a[1] = 1;

#include <iostream>
int main(){
  int ary[10];
  std::cout << ary << std::endl;
  // 0x61fee8
  std::cout << ary + 1 << std::endl;   
  // 0x61feec
  std::cout << (long long)ary + 1 << std::endl;   
  // 6422249    
  std::cout << (int *)((long long)ary + 1) << std::endl;   
  // 0x61fee9
}

#include <iostream>
int ary[160];
int is_admin = 0;
int main(){
  int i,x;
  std::cin >> i >> x;
  ary[i] = x;
  if(is_admin){
    std::cout << "How did you do that?\n";
  }
}

#include <iostream>
int is_admin = 0;
int ary[160];
int main(){
  int i,x;
  std::cin >> i >> x;
  ary[i] = x;
  if(is_admin){
    std::cout << "How did you do that?\n";
  }
}

#include <iostream>
#include <cstring>
struct person{
  char name[16];
  int is_admin;
};
int main(){
  char tmp[16];
  struct person peipei;
  peipei.is_admin = 0;
  std::cin >> tmp ;
  strcpy(peipei.name,tmp);
  std::cout << "Hi! " << tmp << std::endl;
  if(peipei.is_admin){
    std::cout << "Wow! Peipei is so Dian!" << std::endl;
  }
}

#include <iostream>
long long ary[160];
int is_user=0;
int is_admin=0;
int main(){ 
  long long i,x;
  std::cin >> i >> x;
  ary[i] = x; 
  if(is_admin == 1){
    std::cout << "Why Peipei is so dian?\n";
  }
}

#include <iostream>
void put_something(){
    int ary[1]={0}, i, x;
    ary[i] = x;
}
bool can_access(){
    int is_admin = false;
    put_something();
    return is_admin;
}
int main(){ 
    if(can_access()){
        std::cout << "Why Peipei is so dian?\n";
    }
}