Have got error pointer

[Dintey]

void function(int & i)
{
   i=5;
}
int main()
{
   int a=2;
   int *b=&a;
   function(b);
   printf(b);
   return 1;
}

I cant print b

[D_Drmmr]

I cant print b

You will have to fix the compiler errors first.
Since you are writing C++, include <iostream> and use std::cout to print to the screen, instead of using printf.

[Lindley]

The function is expecting a reference to an int, but you are passing it an int* instead.

[Dintey]

Thank you
I fix it this way

#include <iostream>
using namespace std;
void function(int & i)
{
   i=5;
}
int main()
{
   int a=2;
   int *b=&a;
   function(&b);
   cout<<b; 
   return 1;
}

An error has reported,

[chandrasekaran1987]

#include <iostream>
using namespace std;
void function(int* i)
{
*i=5;
}
int main()
{
int a=2;
int *b=&a;
function(b);
cout<<*b;
return 1;
}

[D_Drmmr]

An error has reported,

Look at these lines

   int a=2;
   int *b=&a;
   function(&b);

In the second line you take a pointer to the object a by preceding the variable with an ampersand. In the third line you take a pointer to the object b. Since b has type int*, &b has type int** (pointer to pointer to int). If instead you want to take get the value of what b points to, use *b.

Also, here

   cout<<b;

you are printing the value of b, i.e. the memory address it is pointing to. You can get the value of what b is pointing to in the same way as above.

[Dintey]

Thanks

@chandrasekaran1987..... but I don't want to change it into pointer (in the function)
@D_Drmmr..... Can you write it for me please ?

[GCDEF]

Thanks

@chandrasekaran1987..... but I don't want to change it into pointer (in the function)
@D_Drmmr..... Can you write it for me please ?

Why use a pointer at all? What's wrong with

#include <iostream>
using namespace std;
void function(int& i)
{
    i=5;
}
int main()
{
    int a=2;
    function(a);
    cout<< a; 
    return 1;
}

If you really want the pointer in main

#include <iostream>
using namespace std;
void function(int& i)
{
    i=5;
}
int main()
{
    int a=2;
    int* b = &a;
    function(*b);
    cout<< *b; 
    return 1;
}

[D_Drmmr]

@D_Drmmr..... Can you write it for me please ?

I could, but I generally don't do that since I don't believe it will help you. If you want to see an example then search for one online and you'll find plenty. Then again, I can't imagine that the book you are studying (or your teacher) didn't provide any examples that show how to dereference a pointer. Reapplying that knowledge in another situation is what learning is all about. If you just copy a piece of code written by someone else, you have learned nothing - and that will come to haunt you for sure.