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

It's because you have #include . That header defines macros true and false to be 1 and 0, so your statement looks like this:

printf("%zu\n", sizeof(a ? 1 : 0)); // Why 4?

sizeof(int) is 4 on your platform.