When more than one
operator appears in an expression the order of evaluation depends on
the rules of precedence. A complete explanation of precedence can get
complicated, but just to get you started:

Multiplication and division happen before addition and subtraction. So
2*3-1
yields
5
, not
4
, and
2/3-1
yields
-1
, not
1
(remember that in integer division
2/3
is
0
).

If the operators have the same precedence they are evaluated from left
to right. So in the expression
iMinute*100/60
, the multiplication happens first, yielding
5900/60
, which in turn yields
98
. If the operations had gone from right to left, the result would be
59*1
which is
59
, which is wrong.

Any time you want to override the rules of precedence (or you are not
sure what they are) you can use parentheses. Expressions in parentheses
are evaluated first, so
2 * (3-1)
is
4
. You can also use parentheses to make an expression easier to read, as
in
(iMinute * 100) / 60
, even though it doesn’t change the result.

Note: Incorrect
understanding (usually accidental) of operator precedence is another
major cause of logic errors in a program. If there is a chance of
misunderstanding, it is a good idea to use parentheses.

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