Why this is true ?

Question

If x=10, y=20, z=5

then

why

i=x<y<z (is True in C++)

Answer 1

Because in C++, "<" has a left-to-right associativity.

10<20<5
== (10<20)<5 // 10<20 is True
== (1) < 5 // This is True
== True.

Answer 2

It's because you can't have multiple comparisons, so it only checks the first one, which is true. To make it false, you should do it like this:
i = x < y && y < z;

Answer 3

Thanks for answering.