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5
Advanced Keyboard/PROGRAMMING USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Program the calculator to find all the roots of a real or complex number by
solving the equation z
n
= a + bi using DeMoivre’s theorem.
2. Create a new program with the name ROOTS. Enter the following program
and remember to press ENTER at the end of each line. If you make a mis
take, use the calculator's editing features to correct the error.
3. Enter the following program:
Input N PRGM A 3 ALPHA N ENTER
Input A PRGM A 3 ALPHA A ENTER
Input B PRGM A 3 ALPHA B ENTER
xy->r(A,B)⇒R MATH D 3 ALPHA A , ALPHA B
)
STO ALPHA R ENTER
xy->θ(A,B)⇒θ MATH D 4 ALPHA A , ALPHA B
)
STO ALPHA θ ENTER
0⇒K 0 STO ALPHA K ENTER
Label A PRGM B 0 1 ALPHA A ENTER
Print rθ->x PRGM A 1 MATH D 5
(R^(1÷N),(θ+ ALPHA R a
b
( 1 ÷ ALPHA N )
2πK)÷N) , ( ALPHA θ + 2 2ndF π ALPHA
K ) ÷ ALPHA N ) ENTER
Print rθ->y PRGM A 1 MATH D 6
(R^(1÷N), ALPHA R a
b
( 1 ÷ ALPHA N )
(θ+2πK)÷N) , ( ALPHA θ + 2 2ndF π ALPHA
K ) ÷ ALPHA N ) ENTER
Print “ PRGM A 1 PRGM A 2 ENTER
Wait PRGM A 4 ENTER
K+1⇒K ALPHA K + 1 STO ALPHA K ENTER
If K<N PRGM B 0 3 ALPHA K MATH F
Goto A 5 ALPHA N PRGM B 0 2 ALPHA A ENTER
End PRGM A 6 ENTER
Press 2ndF QUIT to exit the editor.
ROOTS OF
A REAL OR COMPLEX NUMBER
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