Strings
Computer Science: OCR A Level, topic 4.1.5
Strings
Strings are special cases of arrays or lists, where each element is a character. There are many methods we can apply to them:
Concatenation
- Concatenation is joining two strings together.
- This can be done with the + sign. E.g:
- "Hello " + "World" = "Hello World".
Accessing a character
- Remember, strings are just lists. So we can access a specific character in the exact same way as we access a list element:
- string[3] would get the fourth character.
Length of a string
- The length of a string is given by the len function:
- len("Hello") would give 5.
Substrings
- A substring is a part of a longer string.
- In pseudocode, we use the function:
- stringname.subString(startPos, numberOfChars)
- This takes a substring starting at the 'startPos'th character, and takes the stated number of characters.
Test yourself on Strings
What is concatenation?