Algoriyhmic constructs

Algoriyhmic constructs

1. sequence

   • A sequence is a number of instructions that are processed one after the other.
     • Pseudocode Example: DECLARE count SET count TO 1 OUTPUT the value of count

2. assignment

   • deignment is used to store the value of an expression into a variable.
     • Pseudocode Example: DECLARE studentName SET studentName TO Bob

3. iteraton

   • Iteration is also called repetition and is used when something is repeated over and over again, so anything where the program goes round in a loop. Typically programmed using code such as WHILE, REPEAT and FOR statements. See the example of Pseudocode using a FOR loop to write out numbers 1 to 10:
     • Pseudocode Example: DECLARE count SET count TO 0 FOR count = 1 to 10 OUTPUT count END FOR OUTPUT ‘finished’

4. modularisation

   • Modularisation is used to reduce the complexity of a system by deconstructing it into independent units or modules.
     • Pseudocode Example: FUNCTION delivery_charge CALCULATE totalCost IF (totalCost > $10) THEN OUTPUT ‘no delivery charge’ ELSE OUTPUT ‘$5 delivery charge’ ENDIF OUTPUT ‘thankyou’ END FUNCTION

5. Selection and Condition (IF, IF ELSE)

   • A selection statement uses a condition to select, or determine, the next line of the program that is to be executed.
     • Pseudocode Example: CALCULATE totalCost IF (totalCost > $10) THEN OUTPUT 'no delivery charge' ELSE OUTPUT '$5 delivery charge' ENDIF OUTPUT 'thankyou'