Conditional blocks

If you want statement 1 and / or statement 2 to consist of more than one statement, then:

if  condition then begin
  print, 'statement 1a'
  print, 'statement 1b'
  print, 'statement 1c'
endif else begin
  print, 'statement 2a'
  print, 'statement 2b'
  print, 'statement 2c'
endelse

The statements between a begin and an end are called a block of statements.

Blocks of statements can only be used within programs/functions, and cannot be used at the IDL prompt line.