Select

Flow control
Aptilis 1

Select

select is a very useful statement (not a sub) which will execute one block of lines out of several other blocks depending on the value of a variable.
select is a more practical way to implement such things as: 

if a = 1
...
end if

if a = 2
...
end if

if a = 3
...
end if

if a = 4
...
end if

etc...
select will use a variable to decide of what action to take, but first, it will round the variable to its integer value. The corollary to that is that the different possible actions will reflect different cases attached to integer values only.
In addition the different cases cannot be variables, they have to be static values. (This will become clear with the example). A full select block comprises the 'select' and 'end select' lines with no or several cases.
'break' statements are necessary to indicate that you want to exit the select block. You can omit break statements to have two or more cases run with the same value of a variable.

Example 1:
A number speller 

rem the user has to enter a number
n = input(2)
select n
case 1
print("one")
break

case 2
print("two")
break

case 3
print("three")
break

default
print("errrrm, I don't know!")
end select
Result: 
(The user entered 2)
two

(The user entered 3)
three

(The user entered 5)
errrrm, I don't know!

Example 2:
A lazy number speller 

// the user has to enter a number
n = input(2)
select n
case 1
case 2
case 3
print("one or two or three")
break

case 4
print("four or")

case 5

print("five")
break

default
print("errrrm, I don't know!")
end select

Result: 
(The user entered 2)
one or two or three

(The user entered 3)
one or two or three

(The user entered 5)
five

(The user entered 4)
four or five