An algorithm written in pseudocode is shown below.

1 FUNCTION calculateDiscount(spendAmount)
2     IF spendAmount > 100 THEN
3         discount = spendAmount * 0.1
4     ELSE
5         discount = 0
6     END IF
7     RETURN discount
8 END FUNCTION
9
10 SEND "Enter total shopping spend: " TO DISPLAY
11 RECEIVE total FROM (REAL) KEYBOARD
12 SET savings TO calculateDiscount(total)
13
14 IF savings > 0 THEN
15     SEND ("You saved £" & savings) TO DISPLAY
16 ELSE
17     SEND "No discount applied to this purchase" TO DISPLAY
18 END IF