Source:
Browne, Michael E. Ph. D "Schaum's Outlines: Physics for Engineering and Science" 2nd. Ed McGraw Hill: New York. 2010.
HP Prime: INERTIA
This program demonstrates the use of CHOOSE and CASE
EXPORT INERTIA( )
BEGIN
// EWS 2014-06-24
LOCAL c,a,b,m,r;
CHOOSE(c, "Moment of Inertia",
{"Square", "Rectangle", "Cylinder", "Sphere", "Hoop"});
CASE
IF c==1 THEN INPUT({m,a});
RETURN m*a^2/6; END;
IF c==2 THEN INPUT({m,a,b});
RETURN m*(a^2+b^2)/12; END;
IF c==3 THEN INPUT({m,r});
RETURN m*r^2/2; END;
IF c==4 THEN INPUT({m,r});
RETURN 2*m*r^2/5; END;
IF c==5 THEN INPUT({m,r});
RETURN m*r^2; END;
DEFAULT KILL; END;
END;
HP 50g: INERTIA
6/23/2014
<< 1 1 1 1 1
→ c a b m r
<< "Moment of Inertia"
{ { "Square" 1 }
{ "Rectangle" 2 }
{ "Cylinder" 3 }
{ "Sphere" 4 }
{ "Hoop" 5 } }
1 CHOOSE
IF 0 == THEN KILL END
'c' STO
CASE c 1 == THEN
"m" PROMPT "a" PROMPT
SQ * 6 / END
c 2 == THEN
"m" PROMPT "a" PROMPT SQ
"b" PROMPT SQ + * 12 / END
c 3 == THEN
"m" PROMPT "r" PROMPT SQ *
2 / END
c 4 == THEN
"m" PROMPT "r" PROMPT SQ * 2 *
5 / END
c 5 == THEN
"m" PROMPT "r" PROMPT SQ *
END
END >> >>
Notes:
* I just stored a value in the variables c, a, b, m, and r, and used the right arrow ( → ) to make the variables local.
* The IF 0 == THEN KILL END sequence handles the case the user chooses CANCEL over its options.
* The consecutive PROMPT commands saved space instead of using INFORM.
* INERTIA demonstrates the CASE structure
Eddie
This blog is property of Edward Shore. 2014
