**Fun with the Sharp EL-5500 III (May 2018 Edition)**

The EL-5500 III is one of my favorite pocket programming
device, small, portable, and has my favorite programming language: BASIC.

Let’s get started.

Note: Substitute line
numbers with labels that you find fit.
Add defined labels to the first line if you would like. Labels can come from the bottom two rows of
the QWERTY keyboard (A row and Z row).

Comments are followed by double slashes (//), they are not typed.

**Sharp EL-5500 III Program: Net Present Value**

2 PAUSE “NET PRESEN VALUE”

4 CLEAR
// clears all the variables

6 INPUT “CF0:”; N, “RATE:”; I

8 J = 1

10 INPUT “FLOW:”; F,
“FREQ:”; K

12 FOR L=1 TO K: N =
N + F/(1 + I/100)^J: J = J+1

14 NEXT L

16 INPUT “MORE=1: “;
L // enter 1 to enter more cash flows, anything
else to end entry

18 PRINT USING “#############.##”;
“NPV: “; N

20 END

Example:

CF0: -7,000, Interest Rate: 8%

Flow 1: 2,000, Freq
1: 1 (enter 1 for MORE)

Flow 2: 1,500, Freq
2: 2 (enter 1 for MORE)

Flow 3: 2,500, Freq
3: 2 (we are at the end, enter anything
other than 1 at MORE)

Result:

NPV: 2443.06

**Sharp EL-5500 III Program: Synthetic Division**

2 PAUSE “Synthetic
Division”: CLEAR

4 PRINT “P(X)/(X –
R)”: WAIT 59 // WAIT 59 is about 1
second

6 INPUT “DEGREE:”; N

8 DIM P(N): DIM Q(N)

10 FOR I=1 TO N

12 PRINT “COEF OF X^”;
N-I

14 INPUT P(I): Q(I)
= P(I)

16 NEXT I // there is no line 18

20 INPUT “R:”; R

22 FOR I=0 TO N-1

24 Q(I+1) = R*Q(I) +
P(I+1)

26 NEXT I

28 E = Q(N)

30 PRINT “Q(X) = “

32 FOR I=0 TO N-1

34 PRINT Q(I); “X^”;
N-I-1

36 WAIT 150 // about 2.5 seconds

38 NEXT I

40 PRINT “+”; E; “/(X-“;
R; “)”: END

Example: (x^4 – 2*x^3
+ 1) / (x – 1)

Degree: 4

Coefficients: 1, -2,
0, 0, 1

R: 1

Result: 1, -1, -1, -1, no remainder

x^3 – x^2 – x – x

**Sharp EL-5500 III Program: Vector Basics**

Cross product, dot product, norm of two vectors, angle
between two vectors

2 PAUSE “Vector
Basics”

4 INPUT “X1:”; X1, “Y1:”;
Y1, “Z1:”; Z1 \\ vector 1

6 INPUT “X2:’; X2, “Y2:”;
Y2, “Z2:”, Z2 \\ vector 2

8 C1 = Y1*Z2 – Y2*Z1:
C2 = -X1*Z2 + X2*Z1: C3 = X1*Y2 – X2*Y1
// cross product

10 D = X1*X2 + Y1*Y2
+ Z1*Z2 \\ dot product

12 N1 = √(SQU X1 +
SQU Y1 + SQU Z1): N2 = √(SQU X2 + SQU Y2 + SQU Z2) // norm, SQU is the x^2 key

14 DEGREE

16 A = ACS(
D/(N1*N2)) // angle between vectors, ACS
is ACOS

18 PRINT “CROSS X: ”;
C1

20 PRINT “CROSS Y: ”;
C2

22 PRINT “CROSS Z: ”;
C3

24 PRINT “DOT: ”; D

26 PRINT “NORM V1: “;
N1

28 PRINT “NORM V2: “;
N2

30 PRINT “ANGLE: “;
A

32 END

Example: V1 = [-2, 3,
0] and V2 = [ 4, 2, -11]

Cross: [-33, -22, -16]

Dot: -2

Norm V1: 3.605551275

Norm V2: 11.87434209

Angle: 92.67749998°

**Sharp EL-5500 III: Atwood Machine**

M1: mass hanging on
the left side of the machine

M2: mass hanging on
the right side of the machine

The program asks to choose a unit system. Enter 1 for US units (feet, pounds, seconds,
g = 32.174 ft/s^2), anything else for SI units (meters, kilograms, seconds, g =
9.80665 m/s^2).

2 PAUSE “Atwood
Machine”

4 INPUT “1: US,
ELSE: SI “; I

6 IF I=1 THEN LET
G=32.174

8 IF I<>1 THEN
LET G=9.80665

10 INPUT “M1: “; M1,
“M2: “; M2

12 A = (M1 – M2)*G /
(M1 + M2)

14 T = M1 * (G-A)

16 PRINT “Accel.: “;
A

18 PRINT “Tension: “:
T

20 END

Example: M1 = 11.82
kg, M2 = 9.38 kg, use SI units (enter anything other than 1 at the 1:US,
ELSE:SI prompt)

Results:

Accel.: 1.128689906 m/s^2

Tension: 102.5734883 N

Eddie

All original
content copyright, © 2011-2018. Edward
Shore. Unauthorized use and/or
unauthorized distribution for commercial purposes without express and written
permission from the author is strictly prohibited. This blog entry may be distributed for
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