Totalling & Counting (Cambridge (CIE) O Level Computer Science): Revision Note
Exam code: 2210
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 | 
|---|---|
|  |  | 
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 | 
|---|---|
|  |  | 
Worked Example
Write an algorithm using pseudocode that:
- Inputs 20 numbers 
- Outputs how many of these numbers are greater than 50 
[3]
Answer
Count ← 0
FOR x ← 1 TO 20  [1]
    INPUT Number
    IF Number > 50 
        THEN 
            Count ← Count + 1  [1]
NEXT x
OUTPUT Count [1]Unlock more, it's free!
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