Examples
of
use
of
the built-in funcions
(Example 1)
Let's
try
solving the various elements
of
a triangle
with
a BASIC program.
Angle A
of
the triangle shown
in
the
figure
at
right
is
30°,
angle B
is
a right angle, and side CA has a length
of
12. The
following program finds all angles
of
the triangle, the
length
of
its sides, and its
total
area.
1 0
A=3
0
:B=9
0
:CA=12
2 0
AB=CA
::K
COS
CA
::K
PA
I C1 )/
180
)
3 0
BC=CA
::K
S
IN
CA
::K
PA
I C1 )/ 1
80
)
4 0
S=AB
::K
BC
/ 2
5 0
C=18
0
-A-B
6 0
PRINT
"
AB=
"-
;AB.
"
BC=
"
;BC
. "
CA=
" ;
CA
7 0
PRINT
"AREAS=
";
S
8 0
PRINT
"
A=
" ; A . "
B=
" ;
B.
"
C=
" ; C
9 0
END
(Example
2)
Now
let's change line
50
of
the
program
to
use ATN,
the
function for finding the arctangent
of
a
number,
to
fme angle C from sides
AB
and
BC.
1 0
A=3
0:
B=9
0:C
A=12
2 0
AB=CA
::K
COS
CA::K
PA
I C1 )/
18
0)
3 0
BC=
CA::K S
IN
CA::K
PA
I C1 )/ 1 8
0)
4 0
S=AB
::K
BC
/ 2
5 0
C=ATN
C
AB
/
BC
) * 1 8 0 /
PA
I C1 )
6 0
PRINT
7 0
PRINT
8 0
PRINT
9 0
END
"
AB=
"
;AB.
" B C = "
;BC.
"
CA=
" ;
CA
"
ARE
A
S=
" ; S
"
A=
" ;
A.
"
B=
" ;
B.
"
C=
" ; C
RND function
Format
Function
RND
(X)
X
..
Numeric expression
The
RND function returns a pseudo-random
number
in the range from 0.00000001
to
0.99999999.
When X is grea
ter
than
0,
the random
number
returned
is
the one which follows
that
previously generated
by
the
BASIC interpreter in a given pseudo-random
number
series.
When
X~
0,
the
BASIC
Interpreter
's pseudo-random
number
generator is reinitia-
lized
to
start a new series, and
the
pseudo-random
number
returned is the first one
in
that
series. Reinitialization
of
the pseudo-random
number
series in this
manner
can be used
to
allow simulations based on random numbers
to
be reproduced.
72----
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