what will the order of execution

general
1

void main()
{
int a=10,b;
b=(a++)+(a++);
a=(b++)+(b++);
printf(“a=%d and b=%d”,a,b);
}

    acc to me 

    b=(a++)+(a++);
   =10+11=21 and a=22;
    now
    a=(b++)+(b++);
    =21+22=43 and b=23;
     therefore,a=43 and b=23;


     is this  method of solving is correct??? 


         what will be output for ?
         void main()
         {
        int a = 3;
        int b = ++a + a++ + --a;
        printf("Value of b is %d", b);
         }
          using above strategy resulting wrong output?
2

i think that is wrong
bcoz in (++a) incriment will only taes place in next statement ie after ;

a=42
b=20

3

i think that is wrong
bcoz in (++a) incriment will only taes place in next statement ie after ;

a=42
b=20