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ifelse is obsolete and is only provided for reasons of backward compatibility.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 the operator is called ifelse and it is displayed as if in the program text area.
Condition for the if statement.
Default value: 1
If the condition is correct ifelse (as operator) returns 2 (H_MSG_TRUE). Otherwise an exception is raised and an error code returned.