// test_const.cpp     pointer and value  constant and non constant

int main()
{
   int i1 = 1;
   int i2 = 2;
   int i3 = 3;
   int i5 = 5;
   const int ic = 9;                // variable 'ic' unchangable
                                    // naming is pointer_object
                                    // con for constant
                                    // var for variable (not const)
                                    // four cases are possible:
   int * var_var;
   int * const con_var = &i1;        // requires initialization
   const int * var_con;
   const int * const con_con = &i5;  // requires initialization

   var_var = &i2;
   // con_var = &i2;                 // not allowed
   var_con = &i3;
   // con_con = &i2;                 // not allowed
   
   *var_var = 7;
   *con_var = 8;
   // *var_con = 7;                  // not allowed
   // *con_con = 7;                  // not allowed

   // var_var = ⁣                 // not allowed
   // con_var = ⁣                 // not allowed
   var_con = ⁣
   // con_con = ⁣                 // not allowed
   
   return 0;
}