\/\/\/\/\/ C++ question\/\/\/\/\/?

I have no idea how the compilers do it. But as an interesting fact, Java gives out what 37, which accords with what you and I expected. On the other hand, GCC says it should be 35, which is same as Visual C++'s result.

What you must understand is that you could get many different answers for a question like this. Because VC++ gave you 35 and BCC gave you 33, gcc and other compilers might give you something else. In C the + operator does not say who gets evaluated first. So this is why you have different answers.

For example if you did, ans = f() + g(), C does not give specfication of who will be called first [f() or g()]. This type of code is what hurts imperative languages like C, they are the result of a side-effect! Especially in this example as the values of x and y are changed they get evaluated differently for many compilers there is no specification.

In general you would never write code like this.

hey mate,

z=(++x)+(--x)+(x++)+(--y)+(y++)+(--y);

z = (5) + (4) + (4) + (8) + (8) + (8) =37

is equivalent to
x = x + 1
z = x
x = x - 1
z = z + x + x
x = x + 1
y = y - 1
z = z + y + y
y = y+1
y = y - 1
z = z + y

plug in your numbers and you will generate the result,

Hope this helps,

David

hey mate - I'm not sure eh, I thought I was following the standard BOMDAS rules, and as such I agree with your evaluation,
z = (5) + (4) + (4) + (8) + (8) +(8)=37 (which is result in C#)
Maybe consider than only preprocessing is allowed, Thus,
z=(++x)+(--x)+(x++)+(--y)+(y++)+(--y);
z = (5) + (4) + (4) + (8) + (8) + (8) = 37 - incorrect
Consider if only post processing is allowed,
z = (4) + (4) + (4) + (8) + (8) + (8) = 36 - incorrect
Consider no processing on x,y
z = (4) + (4) + (4) + (9) + (9) + (9) = 39 - still incorrect

Not sure mate, the only possibility I can conjugure up is if the compiler converted + -- into +- or -
i.e,
z = (4) - (4) + (4) - (9) + (9) = 4 - still incorrect!

I'm stumped...

I would answer 33. Evaluate the prefix operators before the expression that will be assigned to z.
z = 4+4+4+7+7+7 = 33