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E – 7, Order of operations – CITIZEN SRP-285N User Manual

Page 8

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E – 7

File name : CBM_SR285,A_HDBSR285T19_English.doc

version : 2010/04/26

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The calculator has ten memory variables for repeated use : A, B,
C, X, Y, M, X1, X2, PROG1
and PROG2. You can store a real
number in variables A, B, C, X, Y, M, X1, X2 and an expression in
PROG1 and PROG2. See Example 5.

* [ P/V RCL ] recalls all variables.
* [ SAVE ] lets you store values to variables.
* [ 2nd ] [ RECALL ] recalls the value of variable.
* [ 2nd ] [ CL-VAR ] clears all variables except PROG1, PROG2.
* [ 2nd ] [ CL-PROG ] clears the contents of PROG1, PROG2.

(Note) : Besides pressing [ SAVE ] key to store a value, you can

also assign values to memory variable M by [ M+ ] or
[ 2nd ] [ M– ]. However, anything currently stored in
variable M will be deleted and replaced by the newly
assigned value.

„ Order Of Operations

Each calculation is performed in the following order of precedence :

1) Expression inside parentheses.
2) Coordinates transformation, and Type B functions which are

required pressing the function key before entering, for example,
sin, cos, tan, sin

–1

, cos

–1

, tan

–1

, sinh, cosh, tanh, sinh

–1

,

cosh

–1

, tanh

–1

, log, ln, 10

X

, e

X

, √, NEG, NOT, X'( ), Y'( )

3) Type A functions which are required entering values before

pressing the function key, for example, x

2

,

, ! , x

–1

, %, r,

g.

4) Exponentiation ( ^ ),

X

5) Fractions
6) Abbreviated multiplication format in front of variables, π ,

RANDM, RANDMI.

7) ( – )
8) Abbreviated multiplication format in the front of Type B

functions, 2

3

, Alog2, etc.

9) nPr,

nCr

10) x ,
11) +, –
12) AND, NAND
13) OR, XOR, XNOR
14) Conversion( a

b

/

c

d

/

e

, F

D, DMS )

• When functions with the same priority are used in series,

execution is performed from right to left.

e

X

ln120 Æ e

X

{ ln (120 ) }

otherwise, execution is from left to right.