Print the address or pointer for value in C

Question

I want to do something that seems fairly simple  I get results but the problem is  I have no way to know if the results are correct   I m working in C and I have two pointers  I want to print the contents of the pointer  I don t want to dereference the pointer to get the value pointed at  I just want the address that the pointer has stored    I wrote the following code and what I need to know is if it is right and if not  how can I correct it      item one is a parameter and it comes in as  const void  item1      const Emp  emp1    const Emp   item1    printf   n comp1- gt  emp1    p  item1    p  n   emp1  item1      While I m posting this  and the reason it is important that it is correct  is that I eventually need to do this for a pointer-to-a-pointer  That is   const Emp   emp1    const Emp    item1

User · Answer

I believe this would be most correct   printf   p    void   emp1   printf   p    void    emp1     printf   is a variadic function and must be passed arguments of the right types   The standard says  p takes void

User · Answer

Since you already seem to have solved the basic pointer address display  here s how you would check the address of a double pointer   char   a  char  b  char c    H    b    amp c  a    amp b    You would be able to access the address of the double pointer a by doing   printf  a points at this memory location   p   a   printf  which points at this other memory location   p    a

User · Answer

To print address in pointer to pointer   printf   p  emp1    to dereference once and print the second address   printf   p   emp1    You can always verify with debugger  if you are on linux use ddd and display memory  or just plain gdb  you will see the memory address so you can compare with the values in your pointers

User · Answer

What you have is correct   Of course  you ll see that emp1 and item1 have the same pointer value

User · Answer

I have been in this position  especially with new hardware   I suggest you write a little hex dump routine of your own   You will be able to see the data  and the addresses they are at  shown all together  It s good practice and a confidence builder

User · Answer

char c    A   printf  quot ptr   p  tvalue   c  tand also address   zu quot    amp c  c   amp c    Result  ptr  0x7ffc48e5105f     value  A     and also address  140721531457631

[c] Print the address or pointer for value in C

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