cpointers

lvalue required as unary ‘&’ operand

I have the following lines of code : 

#define PORT 9987

and 

char *ptr = (char *)&PORT;

This seems to work in my server code. But as I wrote it in my client code, it gives this error message : 

lvalue required as unary ‘&’ operand

What am I doing wrong?

Solution

  • C preprocessor is at play here. After the code is preprocessed, this how it looks like.

    char *ptr = (char *)&9987;

    address of (&) operator can be applied to a variable and not a literal.