HP 250 Operating page 60

Keyboard Operations
Here are several examples:
3+(2*5)
13
This is the equivalent of
3+2*5,
even though no parentheses are
present. If two operators have equal priority in an expression
(such as
*
and
I),
then the operations are performed from left to
right. Multiplication has priority over addition, however, so
the expression 2*5 is performed first. When parentheses are
included, the computer evaluates the quantities in parentheses
first.
2)
To solve
(10-5)*<8/4),
press:
(10-S)*(8/4j
10
If no parentheses were used in the key series above:
then the expression would be evaluated in this way. First 5
would be multiplied by 8 giving 40. Second, this value 40 would
bed i vi d e d by 4 g i v i n g 1 O. An d t h i r d, the val u e 1 0 wo u 1 d be
subtracted from 10 giving O.
1
~
2
3
So it is obvious that the use of parentheses (or their omission)
can affect results. When in doubt, put parentheses in an
expression, since all extra sets of parentheses are ignored.
4-3
Keyboard Operations
Here are several examples:
3+(2*5)
13
This is the equivalent of
3+2*5,
even though no parentheses are
present. If two operators have equal priority in an expression
(such as
*
and
I),
then the operations are performed from left to
right. Multiplication has priority over addition, however, so
the expression 2*5 is performed first. When parentheses are
included, the computer evaluates the quantities in parentheses
first.
2)
To solve
(10-5)*<8/4),
press:
(10-S)*(8/4j
10
If no parentheses were used in the key series above:
then the expression would be evaluated in this way. First 5
would be multiplied by 8 giving 40. Second, this value 40 would
bed i vi d e d by 4 g i v i n g 1 O. An d t h i r d, the val u e 1 0 wo u 1 d be
subtracted from 10 giving O.
1
~
2
3
So it is obvious that the use of parentheses (or their omission)
can affect results. When in doubt, put parentheses in an
expression, since all extra sets of parentheses are ignored.
4-3