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3. Bubble Sort pseudocode

The pseudocode below is for the ascending order algorithm. Much like the searching algorithms, you may wish to revisit this page once you have a better grasp on the programming techniques and constructs laid out in our Programming section. For now, just follow the commentaries on each line.

Hover over each line to see the comment about it.
















 

And for completeness sake, a small adjustment to the pseudocode will sort the list in descending order, the only line that changes is the one in red shown below, where the 'greater than' becomes 'less than'

 
     data_set  [9,2,5,23,34,56]	
     last_exam_position  data_set.length - 2     

     swap  true  
			
     WHILE swap == true
       swap  false  
          FOR i  0 TO last_exam_position 
             IF data_set[i] < data_set[i +1] THEN
                 
                   temp  data_set[i+1]
                   data_set[i+1]  data_set[i]
                   data_set[i]  temp   // the swap is complete
                 
                swap  true
             END IF
          ENDFOR
     END WHILE 

     OUTPUT "List is now in descending order." 
    

Challenge see if you can find out one extra fact on this topic that we haven't already told you

Click on this link: What is bubble sorting?