Pointers and void pointer and precedence of & and * operators in pointers.

Pointers
Definition:- A pointer is a variable that stores the memory address of another another variable.

void pointer :-( it can contain address of any data type )
syntax:-    void *pointer_name;
example:- void *v_ptr;
A void pointer does not have any data-type associated it with and can contain the address of any type of variable.
example:- void v_ptr;
                char ch;
                 int i;
                 float fvar;
                 v_ptr= &ch;
                 v_ptr= &i;
                 v_ptr =&fvar;

Precedence of & and * operator:-
Both are unary operators and have precedence equal to other unary operators.
Their associativity is from right to left.
example:-   int n=10,++*ptr;
                  ptr = &n;
                  ptr = 1024
                 
                   ++ *ptr =  ++(1024)
                                = ++(10)
                                = 11
  
                   *ptr++  = (*1024)++
                                =10 ++
                                =10

                    * ++ptr = *(++1024)
                                 = *(1026)
                                 = data at 1026

Program of magic. magic.cpp

#include<iostream.h>
#include<conio.h>
int main()
{
   
    int i,ans=0;
    clrscr();
    cout<<"\nChoose one number in your mind from 1 to 63 \n";
    cout<<"\n1    3    5    7    9    11    13    15 \n";
    cout<<"\n17    19    21    23    25    27    29    31 \n";
    cout<<"\n33    35    37    39    41    43    45    47 \n";
    cout<<"\n49    51    53    55    57    59    61    63 \n";
    cout<<"Write 0 if number in your mind is present or else write 1 if not present\n";
    cin>>i;
    if(i==0)
    {
        ans=ans+1;
    }
    else
    {
        ans=ans;
    }


    cout<<"\n2    3    6    7    10    11    14    15 \n";
    cout<<"\n18    19    22    23    26    27    30    31 \n";
    cout<<"\n34    35    38    39    42    43    46    47 \n";
    cout<<"\n50    51    54    55    58    60    62    63 \n";
    cout<<"Write 0 if number in your mind is present or else write 1 if not present\n";
    cin>>i;
    if(i==0)
    {
        ans=ans+2;
    }
    else
    {ans=ans;}

    cout<<"\n4    5    6    7    12    13    14    15 \n";
    cout<<"\n20    21    22    23    28    29    30    31 \n";
    cout<<"\n36    37    38    39    44    45    46    47 \n";
    cout<<"\n52    53    54    55    60    61    62    63 \n";
    cout<<"Write 0 if number in your mind is present or else write 1 if not present\n";
    cin>>i;
    if(i==0)
    {
        ans=ans+4;
    }else
    {ans=ans;}
    cout<<"\n8    9    10    11    12    13    14    15 \n";
    cout<<"\n24    25    26    27    28    29    30    31 \n";
    cout<<"\n40    41    42    43    44    45    46    47 \n";
    cout<<"\n56    57    58    59    60    61    62    63 \n";
    cout<<"Write 0 if number in your mind is present or else write 1 if not present\n";
    cin>>i;
    if(i==0)
    {
        ans=ans+8;
    }else
    {ans=ans;}
    cout<<"\n16    17    18    19    20    21    22    23 \n";
    cout<<"\n24    25    26    27    28    29    30    31 \n";
    cout<<"\n48    49    50    51    52    53    54    55 \n";
    cout<<"\n56    57    58    59    60    61    62    63 \n";
    cout<<"Write 0 if number in your mind is present or else write 1 if not present\n";
    cin>>i;
    if(i==0)
    {
        ans=ans+16;
    }else
    {ans=ans;}

    cout<<"\n32    33    34    35    36    37    38    39 \n";
    cout<<"\n40    41    42    43    44    45    46    47 \n";
    cout<<"\n48    49    50    51    52    53    54    55 \n";
    cout<<"\n56    57    58    59    60    61    62    63 \n";
    cout<<"Write 0 if number in your mind is present or else write 1 if not present\n";
    cin>>i;
    if(i==0)
    {
        ans=ans+32;
    }else
    {ans=ans;}
    cout<<"The answer in your mind is : ";
    cout<<ans;
    getch();
    return 0;
}