evaluation « operator « C Q&A

1. Operator Precedence - Expression Evaluation    stackoverflow.com

For the following code snippet I get the output as 1. I want to know how it came?

void main()
{
int x=10,y=20,z=5,i;
i=x<y<z;
printf("%d",i);
}

2. operator evaluation question    bytes.com

Hi, I see the following description in <>, the order is defined for && and || and a couple of other operators. These 2 evaluate their operands in a strict left-to-right oder, stopping when the result is known. Is this really true? I think the order is compiler dependent. Thanks.

3. hierarchy of operators and evaluation    cboard.cprogramming.com

4. evaluation of the increment and decrement operators in C?    cboard.cprogramming.com