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"
CHEZY'S
EQN"
{ "R:" "Hydraulic radius" 0 } { "S:" "Channel bed slope"
0} } { 2 1 } { 120 1 .0001} { 110 1.5 .00001 }
IF THEN OBJ
DROP
"Operation cancelled" MSGBOX END »
Running program @INFP2 produces the following input form:
Example 3 – Change the field format information list to { 3 0 } and save the
modified program into variable INFP3. Run this program to see the new input
form:
Creating a choose box
Function CHOOSE („°L@) @ @IN@@ @CHOOS@) allows the user to create a
choose box in a program. This function requires three arguments:
1. A prompt (a character string describing the choose box)
2. A list of choice definitions {c
have any of two formats:
a. An object, e.g., a number, algebraic, etc., that will be
displayed in the choose box and will also be the result of the
choice.
b. A
list
object_displayed
object_result is selected as the result if this choice is selected.
3. A number indicating the position in the list of choice definitions of the
default choice. If this number is 0, no default choice is highlighted.
{
{
"C:" "Chezy's
C R S 'C*(R*S)'
c
... c
}. A choice definition c
1
2
n
{object_displayed
object_result}
is
listed
in
coefficient"
0}
INFORM
NUM "Q"
TAG ELSE
can
i
so
that
the
choose
box,
and
Page 21-31
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