Totalling & Counting (Cambridge (CIE) IGCSE Computer Science)

Revision Note

Robert Hampton

Written by: Robert Hampton

Reviewed by: James Woodhouse

Totalling & Counting

How do you use totalling in a program?

  • Totalling involves adding up values, often in a loop

  • A total variable is set to 0 at the beginning of the program and then updated within a loop, such as:

Pseudocode

Python

Total ← 0

FOR I ← 1 to 10

INPUT Num

TOTAL ← TOTAL + Num

NEXT I

OUTPUT Total

total = 0

for i in range(1, 11):

num = int(input("Enter a number: "))

total = total + num

print("Total:", total)

How do you use counting in a program?

  • Counting involves keeping track of the number of times a particular event occurs

  • A count variable is set to 0 and then updated within a loop, such as:

Pseudocode

Python

Count ← 0

FOR I ← 1 to 10

INPUT Num

IF Num > 5

THEN

Count ← Count + 1

ENDIF

NEXT I

OUTPUT Count

count = 0

for i in range(1, 11):

num = int(input("Enter a number: "))

if num > 5:

count = count + 1

print("Count:", count)

Worked Example

Write an algorithm using pseudocode that:

  • Inputs 20 numbers

  • Outputs how many of these numbers are greater than 50

[3]

Answer

FOR x ← 1 TO 20 [1]

INPUT Number

IF Number > 50

THEN

Total ← Total + 1 [1]

NEXT x

PRINT total [1]

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Robert Hampton

Author: Robert Hampton

Expertise: Computer Science Content Creator

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.

James Woodhouse

Author: James Woodhouse

Expertise: Computer Science

James graduated from the University of Sunderland with a degree in ICT and Computing education. He has over 14 years of experience both teaching and leading in Computer Science, specialising in teaching GCSE and A-level. James has held various leadership roles, including Head of Computer Science and coordinator positions for Key Stage 3 and Key Stage 4. James has a keen interest in networking security and technologies aimed at preventing security breaches.