The law of construction read the question

The law of construction temporarily read only the fourth chapter of the project, some problems in reading the first few chapters:

1, P18 Some software enterprises not only free, and even the source code is also a gift, but require the source code developers to comply with some kind of convention, I do not understand how they profit for this software enterprise?

2. The P40 page mentions that random number testing does not produce repeatable, consistent results. Can you make the following improvements, record the randomly generated input into a file, and then run the program, and when an error occurs, the program reports which input, so that you can think of entering the wrong data for debugging, so that the error will be reproduced.

3, P54 page mentioned regression test, then how to avoid the change of the program can not pass the previous version of the program test point such a problem?

4. P78 page mentions the role of annotations, I am still not very clear in what circumstances need to use comments? Is there a difference between annotations and specifications in object-oriented programming?

5, P79, about Goto statement, almost all of the programming language teachers say do not use, then why the book in the emphasis on the normative and at the same time to allow this easy to make the procedural logic confusion of the wording?

The term software was first proposed in the 1958 Turkey in the paper "The Teaching of Concrete mathematics".

The term software engineering was first proposed by Margaret Hamilton when NASA designed the software on the Apollo computer.

The law of construction read the question