Selectively Accepting or Skipping Lines of Input[LINK]

The ##if series of commands is used to selectively accept or skip lines of input according to the following sequence:

##if  {condition1}
  line1a
  line1b
….

##elseif  {condition2}
  line2a
  line2b

##elseif  {condition3}
  line3a
  line3b
….

##else
  line N a
  line N b
….

##endif

Then the lines that will be included into the EnergyPlus input stream are:

If {condition 1} is TRUE,
  line1a
  line1b
….
otherwise

If {condition 2} is TRUE,
  line2a
  line2b
….
otherwise

If {condition 3} is TRUE,
  line3a
  line3b
….

otherwise

If {condition 1}, {condition 2}, {condition 3} are all FALSE.
  line N a
  line N b
….

There are six different ##if… commands:

Command	–	Result
##ifdef	{macro name}	: if macro name defined, include following lines
##ifndef	{macro name}	: if macro name NOT defined, include following lines
##if	{condition}	: if condition is TRUE, include following lines
##elseif	{condition}	: if condition is TRUE, and previous conditions are FALSE, include
##else	–	: if all previous conditions are FALSE, include following lines
##endif	–	: indicates the end of the if block

Notes: {macro name} is explained in section Defining Blocks of Input, below. {condition} is 0 or BLANK meaning FALSE, and any other character meaning TRUE. ##ifdef and ##ifndef do not have corresponding ##elseif commands, but they do have corresponding ##else and ##endif commands.