Questions:

1. Describe the advantages and disadvantages of some programming environment you have used.
2. How do type declaration statements for simple variables affect the readabilty of a languages. considering that some languages do not require them?
3. Write an evaluation of some programming language you know, using the criteria described in this chapter.
4. Some programming languages for example,Pascal have used the semicolon to separate statements,while Java uses it to terminate statements. Which of these, in your opinion, is most natural and least likely to result in syntax errors? Support your answer.
5. Many contemporary languages allow two kinds of comments: one in which delimiters are used on both ends (multiple-line comments), and one in which a delimiter marks only the beginning of the comment (one-line comments). Discuss the advantages and disadvantages of each of these with respect to your criteria.

Answers:

1.Programming Environment

Virtual Basic

Advantages: Extremely easy to use, even for people who are not computer programmers. Can be used for low level programming on Microsoft computers. Excellent for writing little programs and pieces of programs. Speed of the resulting application. C source code can be optimized much more than higher level languages because the language set is relatively small and very efficient. C programming language is very easier to learn. The main advantages of C language is that there is not much vocabulary to learn, and that the programmer can arrange for the program is very fast.
Disadvantages: Completely locks you into using the Microsoft product line. Not a true Object oriented language although it claims to be. VB .Net is an object oriented language. Becomes overly complex and difficult to manage on very large programs.

C

Advantage: C programming language is very easier to learn. The main advantages of C language is that there is not much vocabulary to learn, and that the programmer can arrange for the program is very fast.
Disadvantages: C does not have OOPS feature that’s why C++ is developed. If you know any other modern programming language then you already know its disadvantages. There is no strict type checking (for example: we can pass an integer value for the floating data type).

2. The use of type declaration statements for simple scalar variables may have very little effect on the readability of programs. If a language has no type declarations at all, it may be an aid to readability, because regardless of where a variable is seen in the program text, its type can be determined without looking elsewhere. Unfortunately, most languages that allow implicitly declared variables also include explicit declarations. In a program in such a language, the declaration of a variable must be found before the reader can determine the type of that variable when it is used in the program.

3. Readability:
Java has some issues with simplicity with respect to readability. There is feature multiplicity in Java as shown in the textbook, example count=count + 1, count ++, count +=1 and ++count. Control statements in Java have higher readability than BASIC and Fortran because they can use more complex conditionals like for loops
Writability:
Java has a fair bit of orthogonality in that its primitive constructs can be used in various different ways
Reliability:
Java uses a type checker at compile time which virtually eliminate most of the type errors during run time

4. I personally feel that Pascal’s usage of the semicolon to separate statement is rather counterintuitive but possibly it’s because I learned the usage of the semicolon to terminate statement in C before I learned Pascal. Java consistency is more intuitive than the structure of Pascal, it’s easier to remember not to put a semi colon after a right brace than it is to have watch out for not putting it after each statement.

5. The main disadvantage of using paired delimiters for comments is that it results in diminished reliability. It is easy to inadvertently leave off the final delimiter, which extends the comment to the end of the next comment, effectively removing code from the program. The advantage of paired delimiters is that you can comment out areas of a program. The disadvantage of using only beginning delimiters is that they must be repeated on every line of a block of comments. This can be tedious and therefore error prone. The advantage is that you cannot make the mistake of forgetting the closing delimiter.