IGCSE Algorithms and Pseudocode Foundations for G8 Practice Exam

Ready-made tools provided by a programming language are called library routines. They are prewritten functions or procedures packaged into libraries that you can reuse by importing or linking them into your program. This lets you perform common tasks—like math operations, string handling, or input/output—without writing the code from scratch, saving time and reducing errors.

Global variables are storage locations accessible from anywhere in the program, local variables are limited to a specific scope, and procedures are blocks of code you write to perform tasks. Library routines differ because they are ready-to-use building blocks supplied by the language or its libraries, not something you create anew for each program.