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32. Self-Documenting Code
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32.4 Keys to Effective Comments
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As long as there are illdefined goals, bizarre bugs, and unrealistic schedules, there will be Real Programmers willing to jump in and Solve The Problem, saving the documentation for later. Long live Fortran! Ed Post, from Real Programmers Don t Use Pascal
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What does the following routine do
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Java Mystery Routine Number One
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// write out the sums 1..n for all n from 1 to num current = 1; previous = 0; sum = 1; for ( int i = 0; i < num; i++ ) { System.out.println( "Sum = " + sum ); sum = current + previous; previous = current; current = sum; }
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Your best guess This routine computes the first num Fibonacci numbers. Its coding style is a little better than the style of the routine at the beginning of the chapter, but the comment is wrong, and if you blindly trust the comment, you head down the primrose path in the wrong direction. What about this one
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Java Mystery Routine Number Two
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// set product to "base" product = base; // loop from 2 to "num" for ( int i = 2; i <= num; i++ ) { // multiply "base" by "product" product = product * base; } System.out.println( "Product = " + product );
Your best guess This routine raises an integer base to the integer power num. The comments in this routine are accurate, but they add nothing to the code. They are merely a more verbose version of the code itself. Here s one last routine:
Java Mystery Routine Number Three
// compute the square root of Num using the Newton-Raphson approximation
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r = num / 2; while ( abs( r - (num/r) ) > TOLERANCE ) { r = 0.5 * ( r + (num/r) ); } System.out.println( "r = " + r );
Your best guess This routine computes the square root of num. The code isn t great, but the comment is accurate. Which routine was easiest for you to figure out correctly None of the routines is particularly well written the variable names are especially poor. In a nutshell, however, these routines illustrate the strengths and weaknesses of internal comments. Routine One has an incorrect comment. Routine Two s commenting merely repeats the code and is therefore useless. Only Routine Three s commenting earns its rent. Poor comments are worse than no comments. Routines One and Two would be better with no comments than with the poor comments they have. The following subsections describe keys to writing effective comments.
Kinds of Comments
Comments can be classified into five categories:
Repeat of the Code
A repetitious comment restates what the code does in different words. It merely gives the reader of the code more to read without providing additional information.
Explanation of the Code
Explanatory comments are typically used to explain complicated, tricky, or sensitive pieces of code. In such situations they are useful, but usually that s only because the code is confusing. If the code is so complicated that it needs to be explained, it s nearly always better to improve the code than it is to add comments. Make the code itself clearer, and then use summary or intent comments.
Marker in the Code
A marker comment is one that isn t intended to be left in the code. It s a note to the developer that the work isn t done yet. Some developers type in a marker that s syntactically incorrect (******, for example) so that the compiler flags it and reminds them that they have more work to do. Other developers put a
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specified set of characters in comments so that they can search for them but they don t interfere with compilation. Few feelings are worse than having a customer report a problem in the code, debugging the problem, and tracing it to a section of code where you find something like this:
return NULL; // ****** NOT DONE! FIX BEFORE RELEASE!!!
Releasing defective code to customers is bad enough; releasing code that you knew was defective is even worse. I have found that standardizing the style of marker comments is helpful. If you don t standardize, some programmers will use *******, some will use !!!!!!, some will use TBD, and some will use various other conventions. Using a variety of notations makes mechanical searching for incomplete code error prone or impossible. Standardizing on one specific technique such as using TBD allows you to do a mechanical search for incomplete sections of code as one of the steps in a release checklist, which avoids the FIX BEFORE RELEASE!!! problem.
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