C#: Order of function evaluation (vs C)

Question

Take the following C code (K&R pg. 77) :

push(pop() - pop()); /* WRONG */

The book says that since - and /

Answer 1

In C# it is left to right: http://blogs.msdn.com/oldnewthing/archive/2007/08/14/4374222.aspx

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Re: C++ order

Apparently this is because the compiler can't guarantee in which order the functions are evaluated (...why?)

Any particular compiler can guarantee the order. The problem is that the language spec does not specify an order, so each compiler can do whatever it wants. This means you have to add a sequence point between the two method calls if you want to guarantee ordering.