Converting between types:
int("42")→ 42 (string to integer)str(42)→ "42" (integer to string)float("3.14")→ 3.14 (string to real)int(3.9)→ 3 (real to integer, truncates)
Why cast? You can't add "5" + 3 (string + integer). You need: int("5") + 3 = 8
This study notes covers Deep Dive: Type Casting within Data Types for GCSE Computer Science. Revise Data Types in 3.2 Programming for GCSE Computer Science with 19 exam-style questions and 10 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 6 of 9 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Data Types
Which data type is most appropriate for storing a student's age?
A programmer is creating a system to track gym members. State the most appropriate data type for each of the following and justify your choice: (a) the member's surname, (b) the number of visits this month, (c) whether the membership is active.