Programming: Principles and Practice Using C++

Programs help you clarify the problem, not just implement the answer

§0.2 Teaching and learning philosophy；Chapter6—7 Calculator；Chapter10 Input and Output Streams；§11.7—11.8；Chapter26 Design for testing

PPP puts input, errors, types, and debugging into the same set of gradually developing practical problems. The calculator does not have a complete architecture from the start, but gradually separates responsibilities as lexical analysis, syntax, variables, and recovery strategies appear; this is not encouraging lack of planning, but letting the implementation expose requirements that have not yet been thought through. Input processing is similar: successful field conversion, legal range, complete record, and valid output object are four different promises. This site uses limited string parsing to demonstrate establishing candidate values first then committing, avoiding erroneous records leaving a half new piece of data. The Graph_lib in the textbook is for teaching, the prediction of C++14 concepts was not an ISO-published feature at the time; modern reading needs to distinguish persistent engineering principles, the library environment of the time, and transcription defects.