C programming question [duplicate]

This question already has an answer here: Closed 11 years ago.

Possible Duplicate:

What is value of c, if c =a,b;

How does the initialization of int variables work in the following question:

main()
{
   int i,j,k;
   i=1,2;
 开发者_JAVA技巧  j=(1,2);
   k=(1,2),(3,4);
}    

I need to be able to describe what the compiler actually does.

---

comma is used as separator as well as an operator. the three cases are dealt as below: first: i=1,2; assignment has higher precedence to comma(,) so i=1 is evaluated i.e. i is given value 1 and then 2 is just put there without any use. second: j=(1,2) parentheses has highest precedence so contents inside it will be evaluated first (1,2) will result to 2 and hence j is assigned value 2. third: k=(1,2),(3,4); here (1,2) and (3,4) are evaluated to 2,4 and then it is like the first expression i.e. k=2,4 so k will be assigned value 2.

hope this helps :D