How to Answer Programming Questions (Cambridge (CIE) IGCSE Computer Science): Revision Note

The string operation SUBSTRING(Quote, Start, Number) returns a string from Quote

beginning at position Start that is Number characters long. The first character in Quote is in position 1.

Write pseudocode statements to:

• store the string "Learning Never Exhausts The Mind" in Quote

• extract and display the words "The Mind" from the string

• output the original string in lower case.

[5 marks]

What are the inputs? What are the outputs? What processes take place?

The string operation SUBSTRING(Quote, Start, Number) returns a string from Quote

beginning at position Start that is Number characters long. The first character in Quote is in position 1.

• store the string "Learning Never Exhausts The Mind" in Quote

• extract and display the words "The Mind" from the string

• output the original string in lower case.

What constructs will I need to use?

• Sequence

  • Each pseudocode instruction is executed in order

• Assignment

  • Assigning the string to Quote

• String manipulation

  • Using SUBSTRING() to extract part of a string

• Case conversion

  • Using LCASE() (or similar function) to convert the string to lowercase

Do I need to use subprograms?

• In this question, the subprograms are built-in string handling functions:

  • SUBSTRING(Quote, Start, Number) – extracts part of a string

  • LCASE(Quote) – returns the lowercase version of the string

Answer

Pseudocode

Quote ← "Learning Never Exhausts The Mind"

Start ← 25

Number ← 8

OUTPUT SUBSTRING(Quote, Start, Number)

OUTPUT LCASE(Quote)