Computer Science · May / June 2023 · Paper 22 · Question 7

An algorithm has been written in pseudocode to calculate a check digit for a four-digit number. The algorithm then outputs the five-digit number including the check digit. The algorithm stops when –1 is input as the fourth digit. 01 Flag FALSE 02 REPEAT 03 Total 0 04 FOR Counter 1 TO 4 05 OUTPUT "Enter a digit ", Counter 06 INPUT Number[Counter] 07 Total Total + Number * Counter 08 IF Number[Counter] = 0 09 THEN 10 Flag TRUE 11 ENDIF 12 NEXT Counter 13 IF NOT Flag 14 THEN 15 Number[5] MOD(Total, 10) 16 FOR Counter 0 TO 5 17 OUTPUT Number[Counter] 18 NEXT 19 ENDIF 20 UNTIL Flag

Read automatically from the paper; the printed page above is exact.