fork download
copy 
  1. #include <iostream>
  2. #include <cstdio>
  3.  
  4. using namespace std;
  5.  
  6. int main(int argc, char **argv){
  7.     int a = 10, d = 9;
  8.     int &b = a;
  9.     int *c = &a;
  10.     int *e;
  11.     e = &a;
  12.     a = a + 1;
  13.     b += 1;
  14.     *e = 20;
  15.     cout << "a addr : " << &a << " , a val : " << a << endl;
  16.     cout << "b addr : " << &b << " , a val : " << b << endl;
  17.     cout << "c addr : " << &c << " , c val : " << *c << endl;
  18.     cout << "c addr : " << c << " , c val : " << *c << endl;
  19. 	cout << "d addr : " << &e << " , e val : " << *e << endl;
  20.  
  21.     const int * cptr1;
  22.     cptr1 = &a;
  23.     // *cptr1 = 7788;  -> error
  24.     cout << "*c = " << *cptr1 << endl;
  25.     cptr1 = &d;
  26.     cout << "*c = " << *cptr1 << endl;
  27.  
  28.     int *const cptr2 = &a;
  29.     cout << "*c = " << *cptr2 << endl;
  30.     *cptr2 = 78;
  31.     cout << "*c = " << *cptr2 << endl;
  32.     *cptr2 = 10;
  33.     // cptr2 = &b;  -> error
  34.  
  35.     const int *const cptr3 = &a;
  36.     cout << "*c = " << *cptr3 << endl;
  37.     // *cptr3 = 7788;  -> error
  38.     // cptr2 = &b;  -> error
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0s 4328KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
a addr : 0x7ffc7bd925a4 , a val : 20
b addr : 0x7ffc7bd925a4 , a val : 20
c addr : 0x7ffc7bd925a8 , c val : 20
c addr : 0x7ffc7bd925a4 , c val : 20
d addr : 0x7ffc7bd925b0 , e val : 20
*c = 20
*c = 9
*c = 20
*c = 78
*c = 10
https://ideone.com/39pU4G
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!