String manipulation and file handling

Overview

Concatenation, length, substring, left, right, upper, lower, ASC and CHR with worked results, and opening, reading, writing and closing text files.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   What is concatenation?

   Model answer

   Concatenation joins two or more strings end to end to make one string. The + operator concatenates strings in OCR Exam Reference Language.

2. 2

   What is output by first = "Ada", then last = "Lovelace", then print(first + " " + last)?

   Model answer

   The code outputs Ada Lovelace. The string " " adds a space between the two names.

3. 3

   What does word.length give when word = "Keyboard"?

   Model answer

   The expression word.length gives 8. The string Keyboard contains eight characters.

4. 4

   What is slicing?

   Model answer

   Slicing means taking part of a string, called a substring. The .substring(x, i) method takes i characters starting at index x.

5. 5

   With word = "Keyboard", what does word.substring(2, 4) return?

   Model answer

   The call returns "yboa". Indexes start at 0, so index 2 is "y", and four characters are taken from there.

6. 6

   With word = "Keyboard", what do word.left(3) and word.right(4) return?

   Model answer

   The call word.left(3) returns "Key". The call word.right(4) returns "oard".

Other ways to work this

The same content, four other ways.

What is inside Levo

Six ways to work the same material.