Let's take a real example.
Let's say Fahrenheit is 58 degrees.
So:
Celcius = 5 / 9 * (Fahrenheit  32)
==>> 5 / 9 * (58  32)
The parens are evaluated first so that
==>> 5 / 9 * 26
Because multiplication and division have the same OPERATOR PRECEDENCE (look it up), that expression is evaluated strictly LEFT TO RIGHT:
so 5 / 9 ==>> 0 (since both 5 and 9 are integers)
and then 0 * 26 ==>> 0
**************
Now consider:
Celcius = (Farenheight  32) * 5 / 9
==>> (58  32) * 5 / 9
==>> 26 * 5 / 9
Again, with multiplication and division equal in precedence, the order is left to right, so:
26 * 5 ==>> 130
130 / 9 ==>> 14 (should be 14.44444444 but remember, this is INTEGER math)
So it all comes down to the order that things are done in.
Here's a related problem for you:
What is the value of 3 + 7 * 5 ??
If you said 50, go back to elementary algebra class.
Multiplication has a higher precedence than addition, so *IT* happens first. Just as if you had coded
3 + ( 7 * 5 ) ==>> 3 + 35 ==>> 38
But, again, that doesn't apply when the two operators have equal precedence. Then it's strictly left to right.
** EXCEPTION IN C++ (and C and C# and...) **
The assignment operators (= and += and *= and so on) happen RIGHT TO LEFT.
That's why you can do
x = y = 7;
a = b += 3;
The y = 7 happens first and then the x = y. Ditto for the b += 3 going first. And then the a = b means that a and b end up with the same value.
There will be a quiz Monday. No calculators allowed.
