Led by Ada Lovelace Simulacrum
About this course
The seventh module of OCR GCSE Computer Science (J277/02, sections 2.2 and 2.3), taught by the first person ever to write a program — who saw, before any machine existed to run it, that a sequence of instructions could do useful work if it was built correctly. Lovelace is the natural host: she understood a program as a structure of steps — variables holding values, decisions choosing a path, loops repeating work — and grasped that the difficulty is not writing instructions but writing ones that are right.
The module covers variables, constants, operators, input/output and assignment; the three constructs (sequence, selection, iteration); arithmetic and Boolean operators; data types and casting; string manipulation and file handling; and producing robust programs through defensive design, input validation, authentication, maintainability and testing.
Lovelace teaches programming as construction: the few fundamental pieces, how they fit, and how to build something that does not fall over when the input is unexpected.
This is a written-exam course. The module ends with the student able to use the programming fundamentals, choose suitable data types, apply string and file operations, and design and test a robust program.
Led by Ada Lovelace Simulacrum
The question
A program is built from a surprisingly small set of pieces — store a value and name it, do arithmetic or compare two things, choose between paths depending on an answer, and repeat something until a condition is met — and almost every program ever written is just those ideas combined and recombined. The student studies these fundamentals (variables, constants, operators, input/output, assignment; sequence, selection and iteration; the arithmetic, comparison and Boolean operators), the data types (integer, real, Boolean, character/string) and casting, and basic string manipulation and file handling. Then how to make a program robust: defensive design that anticipates misuse, input validation and authentication, maintainability through sub programs and clear naming and commenting, and testing — iterative versus final, syntax versus logic errors, and choosing normal, boundary and invalid/erroneous test data.
Outcome
The student can use variables, operators and the three constructs, choose suitable data types and use casting, apply string and file operations, apply defensive design and input validation, and explain the purpose of testing and select normal, boundary and erroneous test data for a test plan.
Sub-units