Name:

elsif -- starts an alternate condition within an if-statement

Synopsis:
```
if (...) then
...
elseif (...)
...
elsif (...) then
...
else
...
endif

```
Description:
```The elsif-statement is used to select a single alternative among a seriesof choices. With each elsif-statement you may specify a condition, which is tested, if the main condition (specified with the if-statement) has failed. Note that elsif might be just as well written as elseif.
Within the example below, two variables a and b are tested against a rangeof values. The variable a is tested with the elsif-statement. The very same tests are performed for the variable b too; but here an involved series of if-else-statements is employed, making the tests much more obscure.

```
Example:
```
input "Please enter a number: " a
if (a<0) then
print "less than 0"
elseif (a<=10) then
print "between 0 and 10"
elsif (a<=20)
print "between 11 and 20"
else
print "over 20"
endif

input "Please enter another number: " b
if (b<0) then
print "less than 0"
else
if (b<=10) then
print "between 0 and 10"
else
if (b<=20) then
print "between 11 and 20"
else
print "over 20"
endif
endif
endif
```
Explanation:
```
Note, that the very same tests are performed for the variables a and b, but can be stated much more clearly with the elsif-statement.
Note, that elsif might be written as elseif too, and that the keyword then is optional.

```

Related: if, else