ifelse — Conditional statement with alternative.
ifelse is obsolete and is only provided for
reasons of backward compatibility.
if should be used instead.
ifelse( : : Condition : )
ifelse is a conditional statement with an alternative.
If the condition is true (i.e., not 0),
all expressions and calls between the head
and operator else are performed.
If the condition is false (i.e., 0)
the part between else and endif is executed.
Note that 该算子 is called ifelse and it is
displayed as if in the program text area.
Condition (input_control) integer → (integer)
Condition for the if statement.
Default: 1
If the condition is correct
ifelse (as operator) returns 2 (
H_MSG_TRUE)
. Otherwise, an
exception is raised and an error code returned.
else,
elseif,
for,
while,
repeat,
until
Foundation