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#include <iostream>
#include <typeinfo>
 
int main()
{
  const int i = 42;
  auto j = i;
  const auto &k = i;
  auto *p = &i;
  const auto j2 = i, &k2 = i;
 
  // print i means int, and PKi means pointer to const int.
  std::cout << "j is " << typeid(j).name()
            << "\nk is " << typeid(k).name()
            << "\np is " << typeid(p).name()
            << "\nj2 is " << typeid(j2).name()
            << "\nk2 is " << typeid(k2).name()
            << std::endl;
  ++j;
  ++*p;
  ++k;
  ++j2;
  ++k2;
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:20:6: error: increment of read-only location ‘* p’
   ++*p;
      ^
prog.cpp:21:5: error: increment of read-only reference ‘k’
   ++k;
     ^
prog.cpp:22:5: error: increment of read-only variable ‘j2’
   ++j2;
     ^
prog.cpp:23:5: error: increment of read-only reference ‘k2’
   ++k2;
     ^

Standard output is empty