Doubt in C increment operator -

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possible duplicate:
post , pre increment in c

i new c, have increment operator program in c 

#include<stdio.h> main(){   int a, b;   = 2;   b = + ++a + ++a;   printf("%d", b);   getchar(); }

the output 10, can explain me how output 10 .

this undefined, ++i can happen in order.

function call arguments ambigiously evaluated, e.g. foo(++i,++i).

not operator chains undefined, a||b||c guaranteed left-to-right, example.

the guarantees made in places known sequence points although terminology being deprecated , clarified in c++0x.

what's odd in example neigher 2+3+4 nor 4+4+3 happened, compiler evaluated left side first in 1 step , right side first in other. optimisation flatten depencency graph.


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