What should be the output of this code & why?

Question

int x = 10, y = 20, z = 5, i;
i = x < y < z;
printf("%d\n", i);

Isn’t it compiler dependent?

Answer 1

No, it is not compiler dependent.
According to C standard operator < shall yield 1 if its left operand is less than the right one, or 0 otherwise (when its value is used).
You can rewtite
int x = 10, y = 20, z = 5, i;
i = x < y < z;
as
i = 10 < 20 < 5
operator < is executed left to right:
i = (10<20) < 5
so 10 < 20 will be evaluated first.
As 10 < 20 is true, it is converted to integer 1 for the next comparision:
i = 1 < 5
which is also true, so result will be 1

Answer 2

Thanks❤ @andriy kan