Question

this is my code. I wrote this part outside my main

typedef struct { int x; } foo;
const int bar = 2;
foo myFoo = { (int) bar };

However this returns:

common.c:6: error: initializer element is not constant
common.c:7: error: (near initialization for ‘myFoo.x’)

If I copy and paste the code into the main it will work.
Can someone give me an explanation please?

Answer 1

you can do using enum like:

typedef struct { int x; } foo;
enum {bar = 2};
foo myFoo = { bar }; 

or

using #define bar 2 like

#define bar 2
typedef struct { int x; } foo; 
foo myFoo = { bar }; 

But both are known at compilation time: why not?

typedef struct { int x; } foo; 
foo myFoo = { 2 }; 
const int bar = 2