How to Create an If-Else-If Ladder in a PlantUML Activity Diagram

Using if, elseif, else keywords we can build is-elseif-else ladder.

ifElseLadder.txt

@startuml

title "Student grade"

start

if (marks < 35) then (yes)
	:Print 'You are failed';
elseif (marks < 50) then (yes)
    :Print 'You are passed and got third class';
elseif (marks < 60) then (yes)
    :Print 'You are passed and got second class';
elseif (marks < 70) then (yes)
    :Print 'You are passed and got first class';
else (no case matched)
    :Print 'You are passed and got distinction';
endif

stop

@enduml

 

Above snippet generate below diagram.

 

By default , the diagram is in horizontal mode, you can change it to vertical mode using  the command ‘!pragma useVerticalIf on’

 

verticalMode.txt

@startuml

title "Student grade"

!pragma useVerticalIf on
start

if (marks < 35) then (yes)
	:Print 'You are failed';
elseif (marks < 50) then (yes)
    :Print 'You are passed and got third class';
elseif (marks < 60) then (yes)
    :Print 'You are passed and got second class';
elseif (marks < 70) then (yes)
    :Print 'You are passed and got first class';
else (no case matched)
    :Print 'You are passed and got distinction';
endif

stop

@enduml

 

Above snippet generate below diagram.

 

  

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