Why does “sizeof(a ? true : false)” give an output of four bytes?

Question

I have a small piece of code about the sizeof operator with the ternary operator:

#include 
#include 

int main()
{
         


        

Answer 1

Here is a snippet from which is what included in the source

#ifndef __cplusplus

#define bool    _Bool
#define true    1
#define false   0

#else /* __cplusplus */

There macros true and false are declared as 1 and 0 respectively.

however in this case the type is the type of the literal constants. Both 0 and 1 are integer constants that fit in an int, so their type is int.

and the sizeof(int) in your case is 4.